Boats & Streams — practice questions, page 5
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A boat's speed in still water is 4.5 m/s and the stream flows at 0.5 m/s. How long does it take to…After the monsoon, a river's speed rises from 2 km/h to 4 km/h. For a launch that moves at 12 km/h…A boat goes 30 km downstream at 15 km/h and then 10 km upstream at 10 km/h. What is its average…The table shows one trip each way for four ferries, each on a different river. On whose river does…A launch goes 28 km downstream in 2 hours, and its upstream speed is 60% of its downstream speed.…Still-water speed and stream speed are in the ratio 9 : 1 for a certain boat. Rowing upstream it…A launch runs at 10 km/h in still water. On Monday the current is 2 km/h; on Tuesday it is 5 km/h.…The current is 3 km/h. A boat takes 3 hours to go 27 km upstream. How long will it take to go 39…The sum of a boat's downstream and upstream speeds is 32 km/h and their difference is 8 km/h. How…The current flows at 2 km/h. A boat takes 1 hour longer to go 15 km upstream than to go 15 km…A speedboat with a still-water speed of 10 km/h goes 2 km upstream and comes straight back in 25…A launch goes 36 km downstream and 18 km upstream in 6 hours. It also goes 24 km downstream and 30…Ghats A and B are 60 km apart, with A upstream. At 8 a.m. boat P (14 km/h in still water) leaves A…Going downstream (12 km/h in still water, current 3 km/h), Dinesh drops a water bottle overboard.…A launch travels at 15 km/h in still water. Its average speed for a trip upstream and back to the…When the current doubles, the upstream speed of a ferry drops from 12 km/h to 9 km/h. What is its…Over a fixed stretch, a boat's upstream and downstream times are in the ratio 5 : 3. Its speed in…A boat's downstream speed is 6 km/h more than its upstream speed. It takes 4 hours to go 48 km…Ghats A, B and C lie in that order down a river, with AB = 24 km and BC = 36 km. A ferry (15 km/h…A river is 400 m wide. A swimmer swims at 3 km/h relative to the water, pointed straight across,…Mukesh can row three-quarters of a kilometre against the stream in 11¼ minutes and return in 7½…Launch B (15 km/h in still water) leaves a jetty going downstream. One hour later launch A (20…In the morning the river flows at 2 km/h; by evening it flows at 4 km/h. A boat (12 km/h in still…The current is one-fifth of a boat's speed in still water. A 36 km out-and-back trip (36 km each…A boat's upstream speed is 25% less than its downstream speed. Over 30 km it needs 1 hour more…
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