In calm water, a man may row at a speed of 5 kilometres per hour. How distant is a location if the current velocity is 1 kmph and it takes him 1 hour to row there and back?
A. 2.4 km
B. 2.5 km
C. 3 km
D. 3.6 km
Answer:A
In calm water, a man may row at a speed of 5 kilometres per hour. How distant is a location if the current velocity is 1 kmph and it takes him 1 hour to row there and back?
A. 2.4 km B. 2.5 km C. 3 km D. 3.6 km
Explanation: Downstream speed = (5 + 1) kmph = 6 kmph,Upstream speed = (5 - 1) kmph = 4 kmph,Let's say the needed distance is x kilometres.Then x/6 + x/4 = 1.12 = 2x + 3x5 times 12,x is equal to 2.4 kilometres.