exam Maths Puzzle Numerical Ability

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.

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I am confused on the greater than or equal to sign
the problem is x-6is greater than or equal to 7
i got the answer x is greater than or equal to 13
i would appreciate any help on this. Thanks directions: simplify. (rad)16a^2. i think the answer is 4a. am i correct?