SOLUTION: Erin starts riding her bike. She is travelling at 10km/h. An hour after Erin starts, her sister, Makayla starts riding her bike. She is travelling at 16km/h. After how long (time)

Question 860931: Erin starts riding her bike. She is travelling at 10km/h. An hour after Erin starts, her sister, Makayla starts riding her bike. She is travelling at 16km/h. After how long (time) will Makayla catch up to her sister?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
let the time taken by Erin when her sister meets her be t
Makayla will take t-1
distans traveled by both is same
d=rt
12t = 16(t-1)
12t=16t-16
4t=16
t=4
catchup time = 4 hours

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