Question

Chloe drives from her house to her Grandma's house 48 miles away in an hour and 12 minutes. How fast was she driving on average?
40 mph 90 mph 4 mph 67 mph

Answer 1

40 mph would be correct. Convert to a fraction, which would be 0.2 and that is roughly 40 mph.

Answer 2

Chloe drove 48 miles in 1 hour and 12 minutes. We want to convert this to miles per hour. Let's convert 12 minutes to hours. There are 60 minutes in an hour, so:

$\sf\dfrac{12}{60}=0.2$

So 12 minutes is 0.2 hours. Chloe drove 48 miles in 1.2 hours. We can divide the number of miles she drove by the time it took her to drive it.

$\sf 48\div 1.2=\boxed{\sf 40~mph}$