Question

if you walk 1.5 hours at 3mph, how fast shoukd you run in the next 0.5 hours to have the average speed of 4mph

Answer 1

7 mph

Explanation:

Answer 2

avg speed= total distance / total time

total time= 0.5+1.5= 2 h

d1= v1 t1=1.5×3=4.5

d2=v2t2

v2=x...let

d2=0.5x

atq....4.5+0.5x/2= 4

4.5+0.5x=8

x= v2=7mph