Stop apps running in the background and make android faster and save battery

There are two trains running on two parallel tracks. Length of each train is 120 m. When they are running in opposite directions, they cross each other in 4 seconds and when they are running in the same direction they cross in 12 seconds. What is the speed of the faster train?

Study the following information carefully and answer the questions given below: Rahul starts running from point A and runs 15 km towards south. He takes a left turn and runs 20 km. Now he runs 9 km after taking a right turn. He finally takes a right turn and runs 20 km and stops at point B. Towards which directions was Rahul moving before he stopped at point B?

Two trains A and B are running in the same direction on the parallel rails such that A is faster than B. Packets of equal weight are transfcrred from A to B. What will happen due to this :

Study the following information carefully and answer the questions given below: Rahul starts running from point A and runs 15 km towards south. He takes a left turn and runs 20 km. Now he runs 9 km after taking a right turn. He finally takes a right turn and runs 20 km and stops at point B. How far is point B with respect to point A?

A man running at a speed of 5 km/h finds that the rain is falling vertically. When the stops running, the finds that the rain is falling at an angle of 60^(@) with the horizontal. The velocity of rain with respect to running man is

Assertion : Among the land animals. Cheetah can run faster over the ground. Reason : Cheetah uses its powerful forelimbs to push it self forward during running.

If Anil runs less fast than Sunil and Sunil runs as fast but not faster than Suraj. Then Suraj runs:

Which of the following actions would make a pulse travel faster along a stretched string?