It takes John exactly 15 minutes to rake a lawn and it takes his son Todd exactly 30 minutes to rake the same lawn. If John and Todd decide to rake the lawn together, and both work at the same rate that they did previously, how many minutes will it take them to rake the lawn?
Choose the correct choice from the following: A) 10 B) 20 C) 36 D) 45 E) 90
1)POE- John takes 15 min so if he takes help of someone else, it has to be less than 30 min..   only A and B are left..   if both do the work in 15 mis each, the combined time will be 7.5 mins   =&gt; 10 10
<result>A</result>
It takes John exactly 15 minutes to rake a lawn and it takes his son Todd exactly 30 minutes to rake the same lawn. If John and Todd decide to rake the lawn together, and both work at the same rate that they did previously, how many minutes will it take them to rake the lawn?