A family wanted to get to another town by 500 PM They had to

A family wanted to get to another town by 5:00 PM. They had to travel 140 miles. The speed limit was 70 miles an hour. At what time should they leave home? Assume that they would be driving at the speed limit and there would be no traffic jams.

Solution

rt=d
rate *time =distance
70*t=140
solve for t
subtract t from 5:00pm
Actually you have to get from the house to the highway which can take a bit of time but math problems generally don\'t take in all the details such as how long it takes to get up to 70mph and how long it takes to decelerate from 70 to zero and get in and out of the car.