math
posted by cymantha .
Mandy runs 4km in 18min. She plans to run in a 15km race. How long will it take her to complete the race?
distance = rate x time
distance  15 km
time = solve for this
rate = 4km/18min
4km/18 mins = 1km/4.5 mins so
15 kms x 4.5 mins = 67.5 mins
= 1 hr 7 mins 30 secs
hope that helkps ~

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