If i am driving 45 miles per from my house to my job. My job is 35 minutes from my house. It is 9:30 i have to be there by 10:00 on the dot so how much should i increase the spe…

Question

asked Sep 22, 2021 233k views

1 Answer

Avrohom Yisroel · Answer 1 · 2021-09-27T23:39:18+0000

Usual speed is given by :

$s = (45* 60)/(35) \ mph\\\\s=77.14 \ mph$

Now, we want to reach job exactly at 10 : 00 .

So, time taken is , t = 10:00 - 09:30

t = 30 minutes = 0.5 hours .

New speed is :

$s'= (45)/(0.5) = 90 \ mph$

Therefore, increase in speed is ( 90 - 77.14 ) = 12.86 mph.

Hence, this is the required solution.