Martin traveled m miles at the rate of r miles per hr and arrived at his destination 1 hr late. How much time should he allow himself to make this trip again and arrive on time?

(A) M
-- +1
r
(B) m-r
-----
r
(C) m-r
(D) m-r-1
(D) m+r
----
r

I chose A...but im now im not too sure if it's correct.

Question

Martin traveled m miles at the rate of r miles per hr and arrived at his destination 1 hr late. How much time should he allow himself to make this trip again and arrive on time?

(A) M
     -- +1
      r
(B) m-r
    -----
        r
(C) m-r
(D) m-r-1
(D) m+r
      ----
        r

I chose A...but im now im not too sure if it's correct.

anonymous · Answer

He should allow 1 more hour than the time he used before. Using the equation s=vt, we know the total time he used was m/r. but in order to be 1 h earlier, he should give 1 h hour. so it should be m/r+1

anonymous · Answer

Thank you!  ^^