Q1 A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

Q2 A boat goes up a river 20 km and down the river 24 km in 8 hours. It also goes up the river 30 km and down the river 28 km in 11 hours. What is the speed of the boat and the river?

Q3 A man can row 9 and ⅓ kmph in still water and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The speed of the current is

Q4 A man rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is :

Q5 A motor covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24km downstream in 6 1/2 hours. The velocity of the stream is :

Q6 A boat covers a certain distance downstream in 1 hour, while it comes back in 1 1⁄2 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

Q7 Bunty is going up the escalator. It takes Bunty 80 seconds to walk up the escalator which is moving upwards and 120 seconds to walk up the escalator which is moving downwards. Calculate the time taken by Bunty to climb the escalator which is stationary.

Q8 A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

Q9 In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

Q10 A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?