Question 889428: two horsemen spot each otherfrom 400 m apart, and start riding towards each other, one at 2/m per sec and the other at 3 /m per sec. a fly starts at one horseand flying at 8 / m per sec flies to the other horse, turns around and immediately flies back. if the fly continues flying back and forth until the horses meet, what total distance does the fly cover ?
Answer by ptaylor(2198)   (Show Source):
You can put this solution on YOUR website! Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r
The two horsemen are closing at the rate of 2+3=5m/sec
So, time it takes the two horsemen to meet: t=d/r=400/5=80 sec
That means the fly is flying for 80 sec. At 8m/sec, this means the fly flies a distance of (d=rt)and d=8*80=640 meters.
Hope this helps---ptaylor
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