Total distance between A and B is d kms . If the distance travelled along the stream is three time of the total distance and the distance and travelled against the stream is two times of the total distance . If the time taken to cover the distance along the stream is 10% less then the time taken to cover the distance against the stream . if a person cover a distance against the stream . if a person cover a distance of 21 km in 1 hr 24 min along the stream , then find the rate of current ?

Options

A. 2 `Km//hr`
B. 3 `Km//hr`
C. 1 `Km//hr`
D. 4 `Km//hr`

Answer

B