Relative Motion (Test 2)

A swimmer can swim at 4 km/h in still water. If the river flows at 2 km/h, what is his effective speed upstream?

Two trains of equal length 120 m are running in opposite directions at 60 km/h and 90 km/h. How long will they take to cross each other?

A man walks at 5 km/h. Rain appears to fall vertically to him. What is the actual direction of rain if its speed is 5 km/h?

A train passes a platform in 36 seconds and a man in 20 seconds. If the train is 180 m long, what is the length of the platform?

A car is moving at 72 km/h. What is its speed in m/s?

A train 200 m long passes a pole in 10 seconds. What is its speed?

A man can swim at 6 km/h in still water. If the river flows at 2 km/h, how long will he take to swim 8 km upstream?

Two trains are moving in the same direction at 50 km/h and 30 km/h. If the faster train takes 20 seconds to pass the slower one, and the length of the slower train is 200 m, what is the length of the faster train?

A man is running at 10 km/h opposite to the direction of rain. Rain appears to fall vertically. What is the actual speed of rain?

A boat takes 3 hours to go 24 km downstream and 6 hours to return. What is the speed of the boat in still water?