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Concept:   Distance = Speed x time

If the distance is unknown, can assume it to be 1; hence, the speed will be 1/time.


Answer:

Every hour, 

  • Xuan travels 1/6 of the total distance., while Moses travels 1/4 of the total distance.

As they are travelling towards each other, the distance they travel together per hour is 

1/6 + 1/4 = 2/12 + 3/12 = 5/12

Assume it takes n hours for them to meet, i.e. they complete the journey jointly, 

n × 5/12 = 1

n = 12/5

12/5 hour = 60 × 12/5 min = 144 min = 2 hours 24 minutes

2 hours 24 minutes after 10 a.m. is  12 p.m. 24 minutes 

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