Two friends start running in an opposite direction 2km/h faster than the other. After one hour they are 10 km apart. What is the speed of both friends.
- 2km/h and 6km/h
- 4 km/h and 6 km/h
- 4 km/h and 8 km/h
- 3 km/h and 6 km/h
Explanation
Let the speed of the slower friend be km/h, then the speed of the faster friend is km/h.
After 1 hour, their total distance apart is the sum of their speeds:
Simplifying:
x=4km/h
So, the slower friend's speed is 4 km/h, and the faster friend's speed is km/h.
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