exam Maths Puzzle Numerical Ability

Celsius temperature readings can be converted to Fahrenheit readings using the formula F=9/5C+32. What is the Fahrenheit temperature that corresponds to each of the following Celsius temperatures: -10, 0, 15, 100?

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I tried to solve this by using the following formulas.

75=d(miles)/t(hours) -> t= d/75

s(speed)= d/75 -> ???

100= 2d/t+t(2nd lap) -> t+t(2nd lap)=d/50

PLEASE HELP ME radical 50/y4 (y to the 4th)