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1. A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water ?
- A. 40 minutes
- B. 40 minutes
- C. 40 minutes
- D. 40 minutes
Answer: Option C
Explanation:
Hints: Rate down stream = 1/10 × 60 km/hr = 6km/hr
Rate up stream = 2 km/hr
speed in still water = 1/2 (6 + 2)km/hr = 4 km/hr
Required time = 5/4 hrs = 1 hrs 15 min
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