Boats & Streams — practice questions with answers
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A boat moves at 12 km/h in still water. The river flows at 3 km/h. What is the boat's speed when…Downstream, a motorboat makes 18 km/h; upstream it makes only 12 km/h. Find its speed in still…On the Hooghly, a launch goes at 22 km/h downstream and 14 km/h upstream. How fast is the river…In the figure, a boat goes from ghat A to ghat B with the current. How long does the trip take?Find the speed of the current if a boat travels 36 km downstream in 2 hours and 24 km upstream in…Rowing 1 km against the current takes Arjun 10 minutes, but 1 km with the current takes only 6…The ratio of a boat's speed in still water to the speed of the stream is 5 : 1. What is the ratio…The boat in the figure has to come back from B to A, against the current. How long will the return…Riya worked out: "Downstream speed is 16 km/h and upstream speed is 10 km/h, so the stream speed…Downstream and upstream speeds of a boat are 21 km/h and 15 km/h. Which of these statements is true?It takes Sameer 3 hours to swim 18 km downstream, and the same 3 hours to swim 12 km upstream.…With a still-water speed of 15 km/h on a river flowing at 5 km/h, what is the ratio of the time…Travelling with the current, a boat covers 40 km in 2 hours. The current flows at 4 km/h. What is…For a boat with still-water speed 20 km/h on a stream of 5 km/h, the upstream speed is what…The table gives downstream and upstream speeds of boats on four rivers. On which river is the…A ferry's speed in still water is 10 km/h and the river flows at 2 km/h. It goes 48 km downstream…A launch with a still-water speed of 10 km/h goes upstream and returns to its starting jetty on a…The stream flows at 4 km/h. A boat covers 84 km downstream in 6 hours. How long will it take to…A log floating freely drifts 9 km in 3 hours. A boat whose speed in still water is 12 km/h travels…In the figure, the boat covers the 66 km from A to B in 3 hours. How long will it take to travel…The boat in the figure goes from A to B in 3 hours. How long will it take to come back from B to A?The stream's speed is one-fourth of a boat's still-water speed. The boat goes 30 km downstream in…Over one stretch of river a boat needs 9 hours upstream but only 6 hours downstream. What is the…Going 3 km upstream takes a rower 30 minutes; going 3 km downstream takes 15 minutes. How long…In the figure, how much longer does the return leg from B to A take than the trip from A to B?
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