a) downstream and (b) up- stream, if the river current is 3 mi/hr? (c) What will be the average speed for the round trip?
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A river steamer can travel at the rate of 15 milhr in still water. How long will the trip between two cities 60 mi apart take (a) downstream and (b) up-
stream, if the river current is 3 mi/hr? (c) What will be the average speed for
the round trip?
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