Have to get the area of the figures when divided and the area with the original formula

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?