walking speed ---- x mph
skateboard speed = 2x mph
time skateboarding = 2:15 - 1:30 = 3/4 hrs
time walking = 3:00 - 2:15 = 3/4 hrs
solve for x
(3/4)x + (3/4)2x = 11.25
take over
At 1:30 Marlon left his house to go to the beach, a distance of 11.25 miles. He rose his skateboard until 2:15, and then walked the rest of the way. He arrived at the beach at 3:00. Marlon's speed on his skateboard is 2 times his walking speed. Find his speed when skateboarding and when walking.
1 answer