Question

If Dan had increased his average speed by 20 miles per
hour, he would have decreased the time it took him to
drive from his job to a certain restaurant by 25%. What
was Dan's actual average speed, in miles per hour,
when he drove from his job to the restaurant?​

Answer 1

Step-by-step explanation:

speed × time = distance

decrease in time is -25% = -1/4

increase in speed = 1/(4-1) = 1/3

in question speed is increase by 20miles

so,

1/3=20

1=60

hence actual av. speed is 60

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