A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
2 hours
3 hours
4 hours
5 hours

• 4 hrs.
  
  Downstream speed = 13 + 4 = 17 kmph
  time taken by the boat to go 68 km downstream. = 68/17 = 4 hrs
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