JJ第599题,不懂如何做

诗琳

600.Machine A makes 7000 products in 8hrs, B makes 7000 in 2hrs. 
  One day A worked twice as long as B, ask what's the ratio of
  A's product to the total products?
  33.3%

怎么算出这个答案的?

dick_yang

这个好像还是蛮简单的吧

A的rate：7000/8

B的rate：7000/2

假设B做了T小时，那么A就做了2T小时

比例就是：（2T*7000/8)/(2T*7000/8 + T*7000/2)=1/3