Question
Download Solution PDFThe speed of a ship in still water is 5 km/hr and the speed of the stream is 2 km/hr. Rohan rows to place at a distance of 21 km and comes back to the starting point. The total time taken by him is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Speed of ship in still water = 5 km/hr
Speed of the stream = 2 km/hr
Distance travelled from each side = 21 km
Formula used:
Time = Distance/Speed
Concept used:
Downstream Speed (D) = speed of ship + speed of stream
Upstream Speed (U) = speed of ship - speed of stream
Calculation:
Downstream speed = 5 + 2 = 7 km/hr
Upstream speed = 5 - 2 = 3 km/hr
Time taken while going downstream = 21/7 = 3 hours
Time taken while going upstream = 21/3 = 7 hours
Total time taken = 7 + 3 = 10 Hours
∴ The total time taken during journey is 10 hours
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