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UkoKoshka [18]
3 years ago
8

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 speed?
Mathematics
1 answer:
son4ous [18]3 years ago
7 0

Usual speed is given by :

s = \dfrac{45\times 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'= \dfrac{45}{0.5} = 90 \ mph

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

Hence, this is the required solution.

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