Question

Two competing gyms each offer childcare while parents work out. Gym A charges $9.00 per hour of childcare. Gym B charges $0.75 per 5 minutes of childcare. Which comparison of the childcare costs is accurate?

Gym B charges $1.05 less per hour than Gym A.
Gym B charges $1.50 less per hour than Gym A.
Gym B charges $5.25 less per hour than Gym A.
Gym B and Gym A charge the same hourly rate for childcare.

Answer 1

there are 60 minutes in an hour

if we divide 60/5 we get 12

so to convert Gym B's $0.75 per 5 minutes of childcare into an hourly rate, we can multiply

0.75 * 12

after that it's a fair comparison between gym A and gym B