Alan mows lawns in the summer to make money. He knows that, on average, he can mow 1/2 of a lawn in 1 1/4 hours. Calculate his average mowing rate in lawns per hour.

0.4 lawns per hour

Step-by-step explanation:

We are asked how long it would take on average to mow all the lawn per hour.

We are told that you can mow half a lawn in 1 1/4 hours, that is to say in 1.25 hours, which means that to mow the lawn completely it must have an average of twice the time, that is:

1.25 * 2 = 2.5

Which means that on average it takes 2.5 hours to mow all the lawn.

1/2.5 =  0.4 lawns per hour

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