Question

A family is taking a cross-country trip by car.they drive at an average speed of 55 mi/h, and their goal is travel at least 400 mi/day.how many hours per day do they need to drive?

Answer 1

Answer:

0.31hour

Step-byd-step explanation:

If a family drives at least 400mi/day, this means they drive at least 400mi/24hours since there are 24hours in a day.

Considering the expression;

If 400 miles = 1day which is also equivalent to 400 miles = 24hours

To get the amount of miles driven in an hour we have;

400miles = 24hours

x miles = 1hour

Cross multiplying we have;

400 × 1 = 24x

x = 400/24

x = 16.7miles

This means means they covered at least distance of 17 miles in an hour.

If their average speed is 55miles/hour.

The number of hours they need to drive per day can be calculated using the expression;

Speed = distance/time

Time = Distance in miles per hour/speed

Time = 17/55

Time = 0.31hour

Answer 2

Distance = 400 mi

Speed = 55 mi/h

time =  Distance / Speed = 400 / 55 ≈7.27   hours.

They need to travel at least 7.27 hours a day.

Hope this helps.