Question

Kishan jogs 9 km at a speed of 6 km per hour. At what speed would he need to jog during the next 1.5 hr to have an average of 9 km per hour for the entire jogging session

Answer 1

Kishan should jog at a speed of 12 km/hr for the next 1.5 hours

1) For the first session of jogging, speed of kishan is 6km/hr

and distance covered is 9 km

2) The time taken in the first session is 9/6= 1.5 hr

3) Second Session time duration given is 1.5 hr

4) He has to maintain speed of 9 km/hr in total time.

Total time is 1.5+1.5=3 hrs.

Total Distance to be covered is 9*3=27 km

5) Distance covered in first session is 9km

6) Distance left for second session is 27-9= 18 km

Time for second session is 1.5 hrs

7) Speed to be maintained is 18/1.5 = 12 km/hr