exam Maths Puzzle Numerical Ability

The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips.
(a) What is

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I have been having alot of trouble with this question. I have to find out what numbers x and f. This is the problem.
2(F+8)-3x=-12.
So far i have this much done.
2(F+8)-3x=-12
2F+16-3x=-12
Please help me out with this problem. A cyclist traveled at a rate of 24mph to visit a nearby town. The cyclist averaged 18mph on the return trip. If the round trip took 4.9 hours find the distance to the nearby town.