exam Maths Puzzle Numerical Ability

aimplify
3
over
4
over
4
over
5

A)16
over
15
B) 15
over
16
C)5
over
3
D)3
over
5

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exam Other Question

Im not sure how to solve problems by rationalizing the denominator An airplane flew for 6 hrs w/ a 22-km/h tail wind.THe return flight against the same wind took 8 hrs.Find the speed of the plane in still air.