A fisherman is on a river in a small boat, rowing at a constant rate. After rowing upstream for a mile, he pasased a toy boat floating downstream. Shortly later, 5 minutes to be exact, he saw a small girl standing on the bank crying about her lost boat, so he turned around and rowed downstream until he overtook the toy boat. If he caught up with the toy boat exactly where he started his journey and if it took exactly one hour after he turned the boat around, what is the rate of the river?
2007-03-21 15:48:04 · 3 answers · asked by WoWzIe 2 in Science & Mathematics ➔ Mathematics
Note that the toy boat going downstream has a speed that is exactly equal to the rate of the river. It took the toyboat 65 minutes (it had a "head start" since the fisherman didn't turn around to go downstream until 5 minutes after he spotted the toy boat). Since R*T = D, we have R*13/12 hour = 1 mile --> R = 12/13 miles per hour
2007-03-25 15:50:10 · answer #1 · answered by Kathleen K 7 · 0⤊ 0⤋
The way I'm reading this, you're saying that the fisherman rowed upstream in 5 minutes the same distance that he rowed downstream in one hour. Something doesn't compute here...
2007-03-21 23:05:25 · answer #2 · answered by Bramblyspam 7 · 0⤊ 0⤋
The toy boat went one mile in 65 minutes. River MPH =0.92
2007-03-22 00:07:02 · answer #3 · answered by Bomba 7 · 0⤊ 0⤋