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Q:

A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 and half an hour. If the speed of the water is 1.5 km / h, then the speed of the boat in still water is: 

  • 1
    19.5 km/h
  • 2
    19 km/h
  • 3
    17 km/h
  • 4
    17.5 km/h
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Answer : 1. "19.5 km/h"

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