A man can row 10 km/h in still water. When the river runs at 2 km/h, it takes him 5 hours to row to a place and come back. Find the distance of the place. MCQ with Answer and Explanation
A man can row 10 km/h in still water. When the river runs at 2 km/h, it takes him 5 hours to row to a place and come back. Find the distance of the place.
A. 28 km
B. 24 km
C. 30 km
D. 20 km
Answer: Option B
Solution (By JKSSB Mock Tests)
Downstream speed = 10 + 2 = 12 km/h. Upstream speed = 10 - 2 = 8 km/h. Let distance be d. d/12 + d/8 = 5 => (2d + 3d)/24 = 5 => 5d/24 = 5 => d = 24 km.
Explanation:
New speed = 6/7 of usual speed => New time = 7/6 of usual time. Difference = 1/6 of usual time = 10 minutes. Usual time = 10 * 6 = 60 minutes.
A transport truck covers a route track of 480 km in 8 hours. How much time will it require to clear a distance path of 360 km given it tracks at the same speed?
No comments yet. Be the first to start the discussion!