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If done long enough, rubbing two sticks together can produce enough heat to start a fire

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If done long enough, rubbing two sticks together can produce enough heat to start a fire. If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is:

a) 0.500 m

b) 5.00 m

c) 10.0 m

d) 100.0 m

e) 2.00 x 10^3 m