A boatman goes 2 km against the current of the stream in 1 hour and g…

Question

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?

Accepted Answer

Option C. 1 hr 15 min. Answer & Solution Answer: Option C Solution: & Rate\, downstream & = ( 110 × 60 )km/hr = 6\,km/hr & Rate\, upstream = 2\,km/hr & Speed\, in\, still\, water & = 1/2 ( 6 + 2 )km/hr = 4\,km/hr & Required\, time & = 5/4 \,hrs & = 11/4hrs & = 1\,hr\,15\, .