Unitary Method ...

Two trains travel in the same directionat 70 km/hr and 43 km/hr, respectively. A man in the slowertrain observes that the faster train passes him completely in 10 seconds.What is the length of the faster train in meters? 

A 350 m long rain moving at anaverage speed of 150km/h crosses a platform in 30 seconds.A man crossed the same platform in 5 minutes. The speed of the manin m/s is

If the speed of a swimmer in still wateris 11 km/h. Find the downstream speed of the swimmer, when the riveris flowing with the speed of 5 km/h?

A train X speeding with 100 kmph crosses anothertrain Y running in the same direction in 4 minutes If the lengths of the trainsX and Y be 200 m and 300 m respectively what is the speed of train Y?

If a car travels at an average speed of 60 kilometres per hour for 3 hours, how many kilometres does it travel?

A train 250 m long is moving at a speed of 30km/h. It will cross a man coming from the opposite direction at a speed of 6km/h in

A and B are 10 kmapart. If they travel in opposite directions, they meet after half an hour. Ifthey travel in the same direction, they meet after 3.5 hours.If A travels faster than B, then the speed of A is

A scooter travels 50 km in 4 hours.How long will it take to travel 500 km?

A dog after seeing a cat finds that the catis 20 leaps ahead of the dog. Cat after seeing the dog starts running andthe dog chases the cat. If in every minute, dog takes 4 leaps while cattakes 9 leaps and I leap of dog is equal to 3 leaps of cat, in howmany minutes will dog catch the cat?

A car travels the first half of a certaindistance with a speed of 20 km/hr, the next half with a speed of 20 km/hr andthe last half distance with a speed of 30 km/hr The average speed of the carfor the whole journey is

Twofriends A and B are 40 km apart and they startsimultaneously on motorcycles to meet each other. The speedof A is 2 times that of B. The distance between themdecreases at the rate of 3 km per minute. Twenty minutes afterthey start A′s vehicle breaks down and A stops and waitsfor B to arrive. After how much time (in minutes) A started riding,does B meet A?

Find the distance covered by an object in 5 minutesat the speed of 12 m/sec.

A man walks a distance 36 km in a given time. 
If he walks 2 km an hour faster, then he will perform the journey 3 hoursearlier .
Find its normal rate of walking.

A car traveling at an average rate of 120 kilometresper hour made a trip in 5 hours. If it had travelled at an average speed of 150kilometres per hour, how many minutes less would the trip have taken?

A man hoes from a place A to B at a speed of 14 km/hrand returns from B to A at a speed of 21 km/hr. The average speed for the wholejourney of distance 14 km is: