David drove 70 miles in the first 1 ¾ hours of his trip. How much longer should it take him to drive an additional 120 miles if he drives at the same average speed?

Answer 1

To find out how long it takes David to drive 1 mile, we divide the distance (70 miles) by the time (1 ¾ hours):
70 miles / 1 ¾ hours = 40 miles/hour.

To find out how long it takes David to drive 120 miles, we divide the distance (120 miles) by the average speed (40 miles/hour):
120 miles / 40 miles/hour = 3 hours.

It should take him an additional 3 hours to drive 120 miles.