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5/2/13 Important Formula: Time and Distance,Problem on Trains,Boats & Streams ~ Elitmusguru::Jump start your career elitmusguru.blogspot.in/2013/04/important-formula-time-and.html 1/4 Home What is pH Test? Test Pattern Aptitude Verbal Logical Reasoning Next Test Submit Resume Paper1 Posted by eLitmus Guru 0 comments Home / Formula / Important Formula: Time and Distance,Problem on Trains,Boats & Streams Important Formula: Time and Distance,Problem on Trains,Boats & Streams Important Formula: Speed = Distance / Time Time = Distance / speed Distance = speed * time 1 km/hr = 518ms 1 m/s = 185Kmhr If the ratio of the speed of A and B is a:b,then the ratio of the time taken by them to cover the same distance is 1a:1b or b:a Suppose a man covers a distance at x km/hr and an equal distance at y km/hr, then the AVERAGE SPEED during the whole journey is (2xy/x+y) km/hr Out of time, speed and distance we can compute any one of the quantities when we happen to know the other two. For example, suppose we drive for 2 hours at 30 miles per hour, for a total of 60 miles. If we know the time and the speed, we can find the distance: 2 hour * 30 mileshour=60 miles If we know the time and the distance, we can find the speed: Enter your email addres Subscribe Subscribe 14 Subscribe FREE updates on your Email | RSS Like 266 Like us!!! vote for us!!! Follow Follow @smartjobz @smartjobz 17 f ollow ers Elitmusguru Like 79 people like Elitmusguru. F acebook social plugin Popular Posts Looking for job? Click here

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Page 1: Important Formula_ Time and Distance,Problem on Trains,Boats & Streams ~ Elitmusguru__Jump Start Your Career

5/2/13 Important Formula: Time and Distance,Problem on Trains,Boats & Streams ~ Elitmusguru::Jump start your career

elitmusguru.blogspot.in/2013/04/important-formula-time-and.html 1/4

Home What is pH Test? Test Pattern Aptitude Verbal Logical Reasoning Next Test Submit Resume Paper1

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Home / Formula / Important Formula: Time and Distance,Problem on Trains,Boats & Streams

Important Formula: Time and Distance,Problem on Trains,Boats & Streams

Important Formula:

Speed = Distance / TimeTime = Distance / speedDistance = speed * time1 km/hr = 518ms1 m/s = 185Kmhr

If the ratio of the speed of A and B is a:b,then the ratio of the time taken by them to coverthe same distance is 1a:1b or b:a

Suppose a man covers a distance at x km/hr and an equal distance at y km/hr,then the AVERAGE SPEED during the whole journey is (2xy/x+y) km/hr

Out of time, speed and distance we can compute any one of the quantities when we happento know the other two. For example, suppose we drive for 2 hours at 30 miles per hour, for atotal of 60 miles.

If we know the time and the speed, we can find the distance:2 hour * 30 mileshour=60 miles If we know the time and the distance, we can find the speed:

Enter y our email address SubscribeSubscribe

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Page 2: Important Formula_ Time and Distance,Problem on Trains,Boats & Streams ~ Elitmusguru__Jump Start Your Career

5/2/13 Important Formula: Time and Distance,Problem on Trains,Boats & Streams ~ Elitmusguru::Jump start your career

elitmusguru.blogspot.in/2013/04/important-formula-time-and.html 2/4

Categories: Aptitude, Formula

60 miles2 hours=30mileshour

Distance is directly proportional to Velocity when time is constant:

Train Problems:

The basic equation in train problem is the sameSpeed=Distance/Time

The following things need to be kept in mind while solving the train related problems.

Boats & Streams:

Let U= Velocity of the boat in still waterV=Velocity of the stream.

While moving in upstream, distance covered, S=(U−V)T

In case of downstream, distance covered , S=(U+V)T

Clock:

For clock problems consider the clock as a circular track of 60km.Min. hand moves at the speed of 60km/hr (think min. hand as a point on the track) and hourhand moves at 5km/hr and second hand at the speed of 3600 km/hr.Relative speed between HOUR hand and MINUTE hand = 55

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When the train is crossing a moving object, the speed has to be taken as the relativespeed of the train with respect to the object.

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