Tim paddled his kayak 12km upstream against a 3km/h current and back again in 5h and 20 min.

Question

A) what was the speed of his kayak?
B) how far could he have gone if there had been no current?

Answer 1

since time = distance/speed,

12/(s-3) + 12/(s+3) = 16/3
s = 6

(16/3)*6 / 2 = 16 km
assuming the same time for the round trip.