Boats & Streams — practice questions, page 3
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A boat's downstream speed is 18 km/h and the river flows at 2 km/h. How far upstream will it go in…Bhavesh rows 3 km upstream in 1 hour; the current is 1.5 km/h. How long will he take to row 15 km…A boat covers 32 km upstream in 4 hours and 36 km downstream in 3 hours. Find its speed in still…Covering 21 km downstream takes a launch 1 h 30 min, and 21 km upstream takes 2 h 20 min. What is…The speed of a stream is 25% of a boat's speed in still water. If the boat's upstream speed is 12…A boatman on Dal Lake (no current) rows at 6 km/h. He now rows on the Jhelum, which flows at 1.5…In the table, a boat's still-water speed and the stream speed are given for four trips. On which…Sunita swims 2 km against the current in 1 hour 20 minutes and the same 2 km with the current in…A launch goes 66 km downstream in 3 hours. If its speed in still water is 18 km/h, how long will…The ratio of a boat's still-water speed to the stream's speed is 7 : 2. What is the ratio of its…Over the same stretch, a boat takes 4 hours upstream and 2 hours downstream. If the stream flows…Raju observes that his boat's downstream speed is 1.5 times its upstream speed. If the current is…A boat travels 3 km upstream in 15 minutes and 3 km downstream in 10 minutes. What is its speed in…Kavya's working: "Boat 12 km/h in still water, current 3 km/h, so 30 km upstream takes 30 ÷ 12 =…If the stream flows at 4 km/h and a boat's upstream speed is half its downstream speed, what is…For a boat with still-water speed 24 km/h on a river flowing at 6 km/h, the downstream speed is…A boat takes 3 hours to go 36 km upstream. If the river flows at 3 km/h, how long will the boat…Each boat in the table was timed on a different river. If all four were raced over 30 km on a calm…A motorboat's downstream and upstream speeds are in the ratio 4 : 3. If its still-water speed is…A swimmer covers 1.2 km downstream in 12 minutes and needs 24 minutes to swim back. What is her…Imran rows 12 km downstream in 1.5 hours. His speed in still water is 6.5 km/h. How long will 12…A boat's downstream speed is 27 km/h and its upstream speed is 19 km/h. Which of the following is…A boat's upstream speed is 80% of its still-water speed. If the stream flows at 3 km/h, what is…A patrol boat that does 15 km/h in still water goes 20 km up a river flowing at 5 km/h and then 20…Over any fixed stretch, a rower takes double the time going against the current that he takes…
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