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 hour 15 minutes
D 1 hour 30 minutes

Correct Answer: 1 hour 15 minutes

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
Bissoy MCQ
#গণিত #নৌকা ও স্রোত (Boat and stream) #Janata Bank Ltd #Janata Bank Ltd - Asst. Executive Officer - 09.01.2015

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