問一題數學~

[fpeipei]

Alex leaves Atlanta heading directly toward Detroit at 8:00 a.m. traveling at 50 mph. Heidi leaves Detroit, 600 miles away, heading directly for Atlanta at the same time, traveling at 70 mph. When do they meet?

A) 12 noon
B) 1 p.m.
C) 1:30 p.m.
D) 2 p.m.
E) 2:30 p.m.

答案
(B) The trip of 600 miles can be broken into two parts, 50T and 70T. Therefore, 50T + 70T =600, therefore 120T = 600. T = 5 hours. 8:00 a.m. + 5 hrs = 1 p.m.

我有點被句意搞混了，不太了解怎麼算出來的！

[吳志道]

我從A飛 Speed=50 Distance=600
他從D飛 speed=70 Distance=600 都早上八點出發
請問我們幾點相遇