A boat can row 11 km/h in still water and the velocity index of the current stream is 3 km/h. Find the time span taken to row 32 km upstream. MCQ with Answer and Explanation

Explanation:
Original speed = 240 / 4 = 60 km/h. New speed = 60 - 10 = 50 km/h. Time for 300 km = 300 / 50 = 6 hours.

Explanation:
Upstream speed = 14 / 4 = 3.5 km/h. Downstream speed = 26 / 4 = 6.5 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (6.5 - 3.5) / 2 = 3 / 2 = 1.5 km/h.

Explanation:
Time difference = 8 - (-2) = 10 minutes = 1/6 hour. Let distance be d. d/5 - d/6 = 1/6 => d/30 = 1/6 => d = 5 km.