Mudrik installed a device on his car that guaranteed to increase his gas mileage by 10%. the gas mileage increased by 3 miles per gallon after installing the device. how many miles per gallon did he get before the device was installed?

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.