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1. 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.
- A. 2 hours
- B. 2 hours
- C. 2 hours
- D. 2 hours
Answer: Option C
Explanation:
Downstream speed = speed of boat + speed of stream
= 13 km/hr + 4 km/hr
= 17 km/hr
Now, 17 km goes in 1 hour
1 km goes in 1/17 hour
68 km goes in ( 68×1)/17 hour = 4 hour
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