Question

Richard goes on a 6-mile jog one morning. He jogs the first two miles at an average speed of 6 mph. He progressively slows down; his average speed during the next two miles is 4 mph. He walks the remaining two miles at an average speed of 3 mph. What is Richard's average speed, in miles per hour?

Answer 1

Answer:

Average speed = 4 mph

Step-by-step explanation:

Given as

Total distance to travel = 6 mile

now, for first 2 mile the avg speed = 6 mph

for next 2 mile the avg speed = 4 mph

and for rest 2 mile the avg speed = 3 mph

so,  the average speed of the Richard = $\frac{3}{\frac{1}{6}+\frac{1}{4}+ \frac{1}{3} }$

Total Avg speed = $\frac{3}{\frac{9}{12} }$

Or,                       = $\frac{3}{9}$×12

                           = 4

So the total Average speed = 4 mph         (Answer)