Submitted by: Mansoor Ul Haque
One moves at 60km/h, so in an hour, he’ll travel 60km
The other moves at 40km/h, so in an hour, he’ll travel 40km
This is towards each other, so, in an hour, we can say that they’ll get 60+40=100km closer.
This means that they get closer at 100km/h
Given that we have the distance of 150km, and the speed of closure at 100kmh, we can now use the equation
Rearrange to find T (times both sides by T)
S x T = D (now divide both sides by S)
Time = 150km divided by 100km/h
Time = 1.5 hours
Or one hour and 30 minutes
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