A boat is moving 2 km against the current of the stream in 1 hour and moves 1…
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A boat is moving 2 km against the current of the stream in 1 hour and moves 1 km in the direction of the current in 10 minutes. How long will it take the boat to go 5 km in stationary water?
- A.
1 hr 20 minutes
- B.
1 hr 30 minutes
- C.
1 hr 15 minutes
- D.
30 minutes
Attempted by 4 students.
Show answer & explanation
Correct answer: C
Answer: (3) 1 hr 15 minutes
Solution:
Downstream = (1/10 × 60) = 6 km/hr
Upstream = 2 km/hr
Speed in still water = ½ (6+2) = 4 km/hr
So, the time is taken by the boat to go 5km in stationary water = 5/4 hrs = 1 ¼ hrs = 1 hr 15 minutes