Question

It took Eric 8 hours to drive to a football game. On the way home, he was able to increase his average speed by 21mph and make the return drive in only 5 hours. Find his average speed on the return drive.

Answer 1

HEY!!

HERE IS YOUR ANSWER,

D = S x T

D = S x 8 ......(to the job interview)

D = (S+21) x 5  ......(returning from the job interview)

Thus,

D = 8S = 5(S+21)  

8S = 5(S+21)

8S = 5S + 105

8S - 5S = 105

3S = 105

S = 105/3

S = 35 mph  .......to the interview

S + 21 = 35 + 21 = 56 mph  .......returning from the interview

Therefore,

The average speed on the return drive = 56 mph.

HOPE IT HELPS YOU,

THANK YOU. ^_^