Q33.
A pump started filling an empty pool with water and continued at
a constant rate until the pool was full. At noon the pool was 1/3 full,
and 1+1/4 hours later it was 3/4 full. What was the total number of
hours that it took the pump to fill the pool?
A. 2+1/3
B. 2+2/3
C. 3
D. 3+1/2
E. 3+2/3
答案C
請問這題要如何解呢 ?作者: gabriel_djh 时间: 2010-7-24 09:07
X is the totall water
so it takes 1+1/4 hours to finish (3/4-1/3) X water
(3/4-1/3)X/(1+1/4)=1/3 X water per hour
so the time to fill the pool is X/ (1/3 X)=3作者: EGHJUYMN 时间: 2010-7-28 21:21
