Boats & Streams — practice questions, page 8
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QuestionA boat's upstream and downstream speeds are in the ratio 2 : 3. If the current were 1 km/h faster,…QuestionThe current is 2 km/h. A boat goes 48 km downstream and returns in 10 hours. How long would the…QuestionTwo launches with the same still-water speed set off at the same moment from opposite ends of a…QuestionA speedboat (18 km/h in still water) leaves ghat A at 9 a.m. for ghat B, 45 km upstream; the…QuestionFor a certain swimmer, the average speed over a swim upstream and back equals three-quarters of…QuestionA boat's out-and-back run takes 4 hours when the current is 2 km/h. When the current doubles to 4…QuestionGhats A, B and C lie in that order down a river: AB = 20 km and BC = 30 km. A launch (12 km/h in…QuestionIn the time a boat goes 3 km upstream, a floating log drifts 1 km. In the time the boat goes 5 km…QuestionTwo swimmers, each 3 km/h in still water, start together from a jetty: one swims upstream, the…QuestionA ferry's speed relative to the water is 5 km/h and the current is 3 km/h; the river is 600 m…QuestionA boat's still-water speed is 5 m/s and the current is 3.6 km/h. How long does it take to go 4.5…QuestionA launch takes 9 hours to go up a stretch and 6 hours to come down it. If its speed in still water…QuestionA motorboat goes downstream from A to B in 3 hours and back in 4.5 hours. The current is 2 km/h.…QuestionThree boats were timed over 24 km on the SAME river (table). One set of timings must have been…QuestionAfter an engine upgrade, a boat's still-water speed rises by 20% and its upstream speed rises by…QuestionThe time a boat takes to go d km upstream and the time it takes to go 2d km downstream are in the…QuestionBoat A (10 km/h in still water) and boat B (15 km/h in still water) each do the same out-and-back…
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