Home
Class 11
PHYSICS
A river 2 km wide is flowing at the rate...

A river 2 km wide is flowing at the rate of 2 km/hr. A boutinan, can row the boat at a speed of 4 km/hr in still water, goes a distance of 2 kam upstream and then cotnes back. The time taken by him to complete his journey is

A

60minutes

B

70minutes

C

80minutes

D

90minutes

Text Solution

Verified by Experts

The correct Answer is:
C
The velocity upstream is (4-2) kin/h and downstream is (4+2)km/h `therefore` Total time taken =`(2 km)/(2 km//hr)+(2 km)/(6km//hr) rarr` 80 min
Promotional Banner

Similar Questions

Explore conceptually related problems

A man of 2 m height walks at a uniform speed of 6km/h away from a lamp post of 6m height. The rate at which the length of his shadow increases is

Suppose two Cars start together in the same direction from the same place. The first goes with uniform speed of 10km//hr. The second goes at a speed of 8km//hr in the first hour and increases the speed by 1//2km each succeeding hour.Find the distance travelled by the first car in 'n' hours.

Suppose two Cars start together in the same direction from the same place. The first goes with uniform speed of 10km//hr. The second goes at a speed of 8km//hr in the first hour and increases the speed by 1//2km each succeeding hour.Find the distance travelled by the second car in 'n' hours.