Boats & Streams — practice questions, page 6
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QuestionA boat's downstream and upstream speeds are in the ratio 7 : 3, and the current flows at 4 km/h.…QuestionRahul's shortcut: "A boat does 12 km/h in still water, so 30 km out and 30 km back takes 60 ÷ 12 =…QuestionA boat goes 12 km downstream and comes back in 2 hours 30 minutes. The stream flows at 2 km/h.…QuestionTwo swimmers start at the same moment from the two ends of a 2.4 km stretch of river and swim…QuestionIn one hour, a boat goes one-third farther downstream than it goes upstream in an hour. Its…QuestionThe table records a launch with the same engine on two days. How much longer does a 30 km upstream…QuestionA launch (14 km/h in still water) goes 60 km downstream from X to Y and then comes back upstream…QuestionA boat with a still-water speed of 15 km/h takes 1 hour less to go 36 km downstream than to go 36…QuestionA motorboat's upstream speed is two-thirds of its downstream speed, and its speed in still water…QuestionOver the same stretch, it takes Ashok four times as long to row upstream as downstream. His speed…QuestionThe current flows at 3 km/h. Rowing 5 km upstream and 5 km back takes a boatman 1 h 15 min. What…QuestionA boat covers 1.5 km upstream in 10 minutes and 1.5 km downstream in 6 minutes. What is the speed…QuestionThe current is 2.5 km/h. A boat takes 2 hours to go downstream between two piers, and the return…QuestionTwo rowing teams race 30 km downstream to a buoy and back. Team X rows at 16 km/h in still water,…QuestionA rower (6 km/h in still water) goes 4 km up a river flowing at 2 km/h and returns. Compared with…QuestionA launch (12 km/h in still water) heads 10 km upstream on a 2 km/h current. Then the current…QuestionLaunch A (10 km/h in still water) leaves a ghat at 6 a.m. going downstream. Launch B (16 km/h in…QuestionA ferry (15 km/h in still water) plies 36 km downstream and back on a river flowing at 3 km/h. Its…QuestionOver the same stretch, a boat's upstream and downstream times are in the ratio 4 : 3. Downstream…QuestionA launch does the same out-and-back run once on a still lake and once on a flowing river (same…QuestionOn any fixed stretch, a boat's downstream trip takes 20% less time than its upstream trip. If its…QuestionFor an out-and-back trip, a student takes the simple mean of a boat's downstream speed (18 km/h)…QuestionAnjali can swim at 2 km/h in still water, but the river flows at 3 km/h. She swims 'upstream' as…QuestionA boat completes a 30 km round trip (15 km out, 15 km back) on a calm lake in 4 hours. How much…QuestionSailing upstream from a ghat at 10 km/h in still water against a 2 km/h current, a boat runs out…
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