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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.
  1. 2km/h and 6km/h
  2. 4 km/h and 6 km/h
  3. 4 km/h and 8 km/h
  4. 3 km/h and 6 km/h
Explanation

Let the speed of the slower friend be xx 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
4 + 2 = 6
km/h.

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