If a motorist had driven 1 hour longer on a certain day and at an average rate of 4 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?
Choices.
A) 100  B) 120  C) 140  D) 150  E) 160
140ase 1:   let rate = R, Time = T, and Distance =D   so D=RT   140ase 2:   (D+70)=(R+4)(T+1)   140ase 3:   (D+X)=(R+10)(T+2)   X=140   Ans 140
<result>C</result>
If a motorist had driven 1 hour longer on a certain day and at an average rate of 4 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?