Suppose that it takes Sally 3 hours to mow, and it takes Tom 4 hours to mow the same lawn; Tom's mower is less powerful than Sally's. Without using algebra determine how long it would take Sally and Tom to mow the lawn if they worked together using both lawn mowers. Comparing and scaling

Question

Suppose that it takes Sally 3 hours to mow, and it takes Tom 4 hours to mow the same lawn; Tom's mower is less powerful than Sally's.  Without using algebra determine how long it would take Sally and Tom to mow the lawn if they worked together using both lawn mowers. Comparing and scaling

Steve · Accepted Answer

hmmm. no algebra? How about Sally can mow 4 lawns in 12 hours Tom can mow 3 lawns in 12 hours together they can mow 7 lawns in 12 hours. So, that means 12/7 hours/lawn