If a motorist had driven 1 hour longer
on a certain day and at an average rate
of 5 miles per hour faster, he would
have covered 70 more miles than he
actually did. How many more miles
would he have covered than he
actually did if he had driven 2 hours
longer and at an average rate of 10
miles per hour faster on that day?
(A) 100 (B) 120 (C)140
(D) 150 (E) 160