Tim and Rich are racing up a 25-foot wall. Tim climbs at 8 inches per minute and Rich climbs at 10 inches per minute. If Tim has a 5 minute head start, by how many SECONDS does the winner beat the other?

Answer 1

25 feet is 300 inches

Tim has a 40 inch head start
... it takes him ... (260 / 8) minutes to reach the top

it takes Rich ... (300 / 10) minutes to reach the top