Question

If you run for 0.4 hours at 7 mph, how fast should you walk during the next 0.8 hours to have the average speed of 5 mph?

Answer 1

Answer:

The answer is 4 mph

Step-by-step explanation:

Answer 2

Speed during the next 0.8 hours is 4 mph.

Given :

Speed in which we run for 0.4 hrs ,$u_1 = 7 \ mph.$

Average speed , V = 5 mph.

We have to find the speed with which we run for 0.8 hrs to maintain average speed of 5 mph , let it be $u_2.$

We know average speed is given by :

$V=\dfrac{t_1u_1+t_2u_2}{t_1+t_2}$

Putting all the values in above equation we get , $u_2=4\ mph$.

Hence , this is the required solution.

Learn More :

Speed and distance

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