1.

The speed of a boat in still water is 8 km/h and the speed of a stream is 1.5 km/h. A man rows to a place at a distance of 61.75 km and comes back to the starting point. What is the total time taken by him?1. 15 h2. 20 h3. 16 h4. 10 h5. 28 h

Answer» Correct Answer - Option 3 : 16 h

Given:

Speed of stream = 1.5 km/h

Speed of a boat in still water = 8 km/h

Distance = 61.75 km

Calculations:

⇒ Rate Upstream = 8 – 1.5 = 6.5 km/h

⇒ Rate Downstream = 8 + 1.5 = 9.5 km/h

⇒ Time take to go upstream = 61.75/6.5 = 9.5 h

⇒ Time take to go downstream = 61.75/9.5 = 6.5 h

⇒ Total time = 9.5 + 6.5 = 16 h

Total time taken by the man is 16 hours.


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