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?

Let us first calculate the average speed of David,

Av speed = Distance traveled/ Time taken

We have, distance = 70 miles

Time = hours = 1.75 hours

Av speed =

= 40 miles/hour

Another 120 miles will be traveled in time, t = 120/40 = 3 hours

that would be because of both gravity and friction. so     c

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