Asked by Bright

A man is rowing a boat at 9km/h in the river 1.5km wide in which current is 5km/h.in which direction should he head in order to get across the river in the shortest possible time? how much time will it take?
Answered by oobleck
he wants to cross straight over, so he needs to head upstream at an angle x, where
sinx = 5/9
That makes his speed across 7.48 km/hr
So, how long will it take to cover the 1.5 km?
Answered by Henry2,
a. Vb - 5i = 9.
Vb = 9 + 5i = 10.3km/h[29.1o] N. of E. = Velocity of boat.

b. d = V*t = 1.5.
9 * t = 1.5,
t = 0.166h = 10 min.

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