J N wrote:If a motorist had driven 1 hour longer and at average rate of 5 miles per hour faster, he would have covered 70 more miles. How many more miles would he have covered if he had driven 2 hours longer and at average rate of 10 miles per hour faster?
100
120
140
150
160
The distance traveled in the extra hour = 70 miles.
The 70 miles traveled in this hour = 5 miles per hour FASTER than the actual rate.
Thus, the actual rate = 70-5 = 65 miles per hour.
10 miles per hour faster = 65+10 = 75 miles per hour.
Distance traveled in 2 hours at 75 miles per hour = 2*75 = 150.
The correct answer is
D.
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