The speed of a boat in still water is 12 km / h, and the speed of the current is 3 km / h. A person goes 135 km in th
unfavorable direction of the stream by boat and returns to the starting point in the direction of the stream. Find the time taken to cover the entire journey in hours.
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speed in down stream = 12+3 = 15 km/hr
speed of boat upstream = 12 - 3 = 9 km/hr
total distance to travel = 135
time taken to travel upstream = 135/9 = 15 hrs.
time taken to travel downstream = 135/15 = 9 hrs
therefore, total time taken to cover the journey = 15 + 9 = 24 hrs
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