A Boatman goes 6 km against the current of the stream in one hours and goes 1 km along the current in 15 min. how long will it take to go 10 km in stationary water?

Options
- 40 min
- 30 min
- 20 min
- None

CORRECT ANSWER : 30 min

Discussion Board
correct answer is: 2hours

we have formula to find boat/boatman speed in still water
x=1/2*[downstreamspeed+upstreamspeed]
x=speed of boat in still water
first find individual speed for up and down stream
speed=distance/time
for upstream = 6km/1hr => 6km/hr.
for downstream = 1km/1/4hr => 4km/hr. #15 min= 1/4 hr.
=1/2*[6+4]
=10/2
=5km/hr.
now we have to find time for distance 10km in still water and we already have speed
speed=distance/ time
=>time =distance / speed
=10km/5km/hr.
=>2hr



ARE Ganesh chowdary 06-16-2023 06:07 AM

wrong

Wrong answer, correct answer should be 120 mins

pankaj 04-20-2022 10:14 AM

Write your comments


Enter the code shown above:

(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)


Advertisement
 
▲