Question

Mary jogs 9 km at a speed of 6 km/hr. at what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging

Answer 1

★12kmph★
is the Right answer of the question "Mary jogs 9 km at a speed of 6 km/hr. at what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging"

Answer 2

From the 1st jogging section we will be able to derive time

T = D/S

T = 9/6=3/2

The next section jogging time has already given 1.5 hrs which means 1 and half hour.

Note -concerting  3/2hr into minutes 3/2*60 = 90 minutes which means 1 and half hour

From this we get the total time as 3 hour

Average speed = Total distance / Total time

Let the 2nd section distance be x

A.S (already give. In question) 9= X+9/3

X=18

Distance = 18

Speed = Distance * Time

Speed = 18*2/3=12km/hr