Boats & Streams — practice questions, page 7
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QuestionA boat's upstream speed is u km/h and its downstream speed is d km/h. Which expression gives the…QuestionA motorboat is three times as fast downstream as upstream. Its speed in still water is 8 km/h. In…QuestionThe current is 1.5 km/h. Sneha swims 1.5 km upstream and back in 45 minutes. What is her speed in…QuestionRavi takes a boat 18 km downstream (10 km/h in still water, current 2 km/h) and then walks back…QuestionA boat's upstream speed is 6 km/h less than its downstream speed, and its speed in still water is…QuestionA motorboat and a raft leave village P together, going downstream. The boat (10 km/h in still…QuestionA boat goes 18 km upstream and 36 km downstream in 6 hours. It also goes 24 km upstream and 24 km…QuestionRowing upstream, Kartik passes a floating log at a bridge. After rowing on for 1 hour he turns…QuestionOver a fixed stretch, a boat's upstream and downstream times are in the ratio 3 : 2. If its…QuestionA launch (18 km/h in still water) must go 60 km upstream on a 3 km/h current. After 2 hours its…QuestionGhats X and Y are 60 km apart, with X upstream. Two boats, each 12 km/h in still water, leave X…QuestionA boat (15 km/h in still water) sails upstream for 2 hours and then turns and sails downstream for…QuestionA river is 300 m wide and flows at 1.8 km/h. Leela swims at 3 km/h relative to the water and…QuestionA ferry is steered straight across a river 0.8 km wide at 4 km/h relative to the water, while the…QuestionA ferry (14 km/h in still water) runs between two ghats 24 km apart on a river flowing at 2 km/h,…QuestionBoat P is twice as fast as boat Q in still water. On a river flowing at 3 km/h, P goes 50 km…QuestionA boat goes 24 km upstream, halts there for 1 hour, and returns on a river flowing at 2 km/h. Its…QuestionA boat goes 27 km down the Krishna, which flows at 4 km/h, and then 27 km up the Tungabhadra,…QuestionGoing downstream, a motorboat passes a raft at point P. Thirty minutes later the boat turns back…QuestionA boat takes 12 minutes to go 1.6 km upstream and 6 min 40 s to cover the same 1.6 km downstream.…QuestionOn a calm day the river flows at 3 km/h; after heavy rain it flows at 5 km/h. A launch (15 km/h in…QuestionA boat goes downstream from town A to town B in 6 hours and returns upstream in 10 hours. How long…QuestionA river steamer takes 3 days to sail down from one port to another and 5 days to sail back. How…QuestionA launch goes 27 km upstream and 45 km downstream in 6 hours, and also 36 km upstream and 30 km…QuestionSwimmers Kabir (3 km/h in still water) and Dev (4 km/h) race from a pier to a buoy 600 m upstream…
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