Question

Betty can mow 4 lawns in 4.4 hours, and Jemma can mow 6 lawns in 5.4 hours. Which sentence describes the difference between the amount of time it will take each girl to mow 7 lawns?

A Betty will take 1.10 hours less than Jemma.
B Jemma will take 1.40 hours less than Betty.
C Betty will take 0.02 hour less than Jemma.
D Jemma will take 0.90 hour less than Betty.

Please help for 30pts!!​

Answer 1

First, we need to determine the time it takes for each girl to mow one lawn.

For Betty:
4 lawns in 4.4 hours, so 4.4 hours ÷ 4 lawns = 1.1 hours per lawn.

For Jemma:
6 lawns in 5.4 hours, so 5.4 hours ÷ 6 lawns = 0.9 hours per lawn.

Now, we need to find the time it takes for each girl to mow 7 lawns.

For Betty:
7 lawns × 1.1 hours per lawn = 7.7 hours.

For Jemma:
7 lawns × 0.9 hours per lawn = 6.3 hours.

Finally, we need to find the difference in time between Betty and Jemma:

7.7 hours (Betty) - 6.3 hours (Jemma) = 1.4 hours.

So, the correct answer is B. Jemma will take 1.40 hours less than Betty to mow 7 lawns.