Question by Summer Clouds - Discuss with MathYouLike

Summer Clouds moderators

04/10/2017 at 10:27

Two boys A and B start at the same time to ride from D to P, 60 km away. A travels 4 km an hour slower than B. B reaches P and at once turns back meeting A 12 km from P. The rate of speed of A was:
a) 4 km/hr
b) 8 km/hr
c) 12 km/hr
d) 16 km/hr

List of answers

Lê Quốc Trần Anh Coordinator 04/10/2017 at 10:53

The distance A rode is: 60 - 12 = 48 (km)

The distance B rode is: 60 + 12 = 72 (km)

The ratio of the speed of A-B is: 48:72 = 2:3

So the rate of speed of A was: 4*2 = 8 (km/h)

Choose B
Selected by MathYouLike
Detecvite Conan 18/10/2017 at 17:47

b)8 km /hr
Detecvite Conan 18/10/2017 at 17:45

d)16 km/hr

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