Boats & Streams — practice questions, page 4
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Farhan rows at 7 km/h in still water on a river flowing at 3 km/h. He leaves his village ghat at 6…A coconut floats 5 km down the Godavari in 2 hours. A boat whose speed in still water is 12 km/h…A motorboat is five times as fast in still water as the current. It goes 48 km downstream in 2…A cargo barge needs 7 hours to push up a certain stretch of river and 5 hours to come down it. Its…A rower takes 40 minutes for 4 km against the current and 24 minutes for 4 km with it. How many…A police boat (16 km/h in still water) heads upstream and a ferry (12 km/h in still water) heads…Launch X (13 km/h in still water) leaves Patna ghat going upstream. Thirty minutes later launch Y…In the figure, the boat leaves A at 7 a.m., reaches B, waits there for 30 minutes, then returns to…A steamer's still-water speed is 25 km/h. It goes 90 km upstream in 4.5 hours. How long will it…A motorboat goes 30 km downstream and comes back in a total of 4.5 hours. The stream flows at 5…A boat goes 24 km upstream in 6 hours and 20 km downstream in 2.5 hours. In how many hours will it…Vimal can row 30 km downstream in the same time that he rows 18 km upstream. If the stream flows…A motor launch makes the 21 km run from A to B downstream in 1.5 hours. The river flows at 2 km/h.…A boat travelling at 6 km/h in still water takes 6 hours to go 16 km downstream and 16 km back…In the time a dinghy sails 20 km down a creek it can sail only 12 km up it. Its still-water speed…Two jetties are 24 km apart. A boat goes downstream from one to the other in 2 hours and returns…A rower's speed in still water is 5 km/h and the river flows at 1 km/h. How many minutes does he…Against the current, a motorboat whose still-water speed is 18 km/h covers 26 km in 2 hours. What…Swati heads straight across a 150 m wide river, swimming at 2.5 km/h relative to the water, while…A motorboat is three times as fast in still water as the current. It needs 6 hours to go 48 km…Upstream, a boat needs 10 minutes for every kilometre; downstream it covers 2.5 km in 10 minutes.…The upstream and downstream speeds of a ferry are in the ratio 2 : 3. It goes 45 km downstream in…Rowing 8 km up a stream and 8 km back takes Hari 4 h 16 min. The stream flows at 1 km/h. What is…In 45 minutes a kayak goes 3 km upstream against a 1 km/h current. How far would it go downstream…A motorboat and a log set off together from P, going downstream. The boat (12 km/h in still water)…
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