Question
 A boat can travel with a speed of 15 km/hr in still
water. If the speed of the stream is 5 km/hr. find the time taken by the boat to go 80 km downstream.Solution
The correct answer is B
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Pipes A and B can fill the tank in 16 and 20 hours respectively. Pipe C empties it in ‘x’ hours. If all are opened together, the tank gets filled in...
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