The Bicycles and the Fly
Two boys on bicycles, 20 miles apart, began racing directly toward each other. The instant they started, a fly on the handle bar of one bicycle started flying straight toward the other cyclist. As soon as it reached the other handle bar, it turned and started back. The fly flew back and forth in this way, from handle bar to handle bar, until the two bicycles met.
If each bicycle had a constant speed of 10 miles an hour, and the fly flew at a constant speed of 15 miles an hour, how far did the fly fly?
If each bicycle had a constant speed of 10 miles an hour, and the fly flew at a constant speed of 15 miles an hour, how far did the fly fly?
posted by Zaux at
8:07 PM
4 Comments:
15 miles. As it would take the two boy 1 hour to meet in the middle.
'nuff said
Relative speed of boy A to boy B
Vab=10-(-10)=20
T=Dab/Vab=20/20=1
Vf=15
Df=Vf*T=15*1
Answer:
15
Cam
The original version of this had the fly going from one rider's forehead to the other's until it was squashed when the two riders' heads collided when they met.
Yes, 15.
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