Question

Roselyn wants to drive her car at a speed of 60 miles per hour for 1.251, point, 25 hours. Her car has a fuel efficiency of 15 miles per gallon. How many gallons of fuel does Roselyn need for her journey? Choose 1 answer: Choose 1 answer: A 2.52, point, 5 gallons B 3.1.25, point, 125 gallons C 0.20, point, 2 gallons D 5 gallons

Answer 1

The number of gallons of fuel Roselyn need for her journey is:

D. 5 gallons

Explanation:

It is given that:

Roselyn wants to drive her car at a speed of 60 miles per hour for 1.25 hours.

This means that the total distance she covers in 1.25 hours is:

`60* 1.25=75\ \text{miles}`

( Since, we know that speed is defined as the ratio of distance to time.

i.e.

`Speed=(Distance)/(Time)\\\\i.e.\\\\Distance=Speed* Time` )

Also, Her car has a fuel efficiency of 15 miles per gallon.

i.e.

She could cover 15 miles with 1 gallon of fuel.

Hence, in order to cover 75 miles.

i.e. to cover (15×5) miles she needs (1×5) gallons of fuel

i.e. she needs 5 gallons of fuel to cover 75 miles.

Answer 2

(60 mi/h)*(1.25 h)/(15 mi/gal) = 5 gal

Roselyn needs D 5 gallons for her trip.