Required Mathematical Intelligence

Chapter 134 How many miles did the flies fly

Two boys each rode a bicycle and started riding towards each other in a straight line from two places 20 miles apart.The instant they started off, a fly on the handlebar of one bike started flying straight to the other bike.

As soon as it reached the handlebar of another bike, it turned and flew back.The fly goes back and forth like this, flying back and forth between the handlebars of the two bikes until the two bikes meet.

If each bicycle travels at a constant speed of 10 miles per hour and the fly travels at a constant speed of 15 miles per hour, how many miles has the fly traveled in total?
[答案：每辆自行车运动的速度是每小时10英里，两者将在1小时后相遇于20英里距离的中点。苍蝇飞行的速度是每小时15英里，因此在1小时中，它总共飞行了15英里。]
(End of this chapter)