Drives 156 lies from rotherdam to london she drives at an average speed of 60 miles per hour she leaves rotherdam at 7: 30am does she arrive in london before 10: 00am?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

the answer is 13 cm