A motorboat whose speed in still water is 16 km/h, took 8 hours to cover a journey 63 km upstream and return. The next day, the speed of the stream was doubled. How long would it take to cover the same distance upstream and return?
a. 8 hours 40 minutes
b. 8 hours 24 minutes
c. 8 hours 30 minutes
d. 9 hours
e. 8 hours 48 minutes
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'a' 8 hours 30 minutes is the right answer.
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