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Boats and Streams

Q1:

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 1 hour

C 1 hr 15 min

D 1 hr 30 min

ANS:C - 1 hr 15 min

Rate downstream = 1 x 60 km/hr = 6 km/hr.
10
Rate upstream = 2 km/hr.
Speed in still water = 1 (6 + 2) km/hr = 4 km/hr.
2
 Required time = 5 hrs = 1 1 hrs = 1 hr 15 min.
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