Subject
Quantitative Aptitude
Topic
Speed & Distance
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 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?
ক)
40 minutesখ)
1 hourগ)
1 hr 15 minঘ)
1 hr 30 minExplanation
Rate downstream = (1/10×60) km/hr = 6 km/hr. Rate upstream = 2 km/hr. Speed in still water = ½(6+2) km/hr =4 km/hr. So, Required time = (5/4) hrs =1×(1/4) hrs = 1 hr 15 min.Related questions
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