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Question

Mr Lee took 6 hrs to drive from Town x to Town Y while Mdm Ong 4 hrs to drive from Town Y to Town X. Both of them started driving at 9am. what time did the 2 of them pass each other?

Answer

Distance between Town X and Town Y -> 12u

Mr Lee took 6 hours to travel 12u.

His speed was 12u ÷ 6 = 2u/h.

Mdm Ong took 4 hours to travel 12u.

Her speed was 12u ÷ 4 = 3u/h.

They met after travelling for time T.

2uT + 3uT = 12u

5uT = 12u

T = 12u ÷ 5u = 2.4 hours = 2 hours 24 mins

They passed each other at 11:24 am.

 

 

0 Replies 0 Likes ✔Accepted Answer
In 1 h,
Mr Lee drove 1/6 of total distance
Mdm Ong drove 1/4 of total distance

1/6 + 1/4 = (2 + 3)/12 = 5/12
5/12 ——- 1h
1/12 ——- 1/5h
12/12 ——- (1/5) x 12 = 12/5 = 2 2/5h
2 2/5h past 9am ——- 11.24am

Ans : 11.24am.

0 Replies 1 Like
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