Question

21. Kiran covers a certain distance, travelling at a speed of 12 km/hr for=rd the distance and a 8
km/hr for the remaining distance. Find his average speed for the entire journey
(a) 6 km/hr (b) 10 km/hr (c) 9 km/hr (d) 12 km/hr (e) None of these​

Answer 1

Answer:

the answer is 10 km/ hour

Step-by-step explanation:

speed=distance/time

speed= 12km per hour + 8 km per hour

speed=20km/2 hour

speed=20/2=10

so the answer is 10 km/hr

Answer 2

Answer:

avg speed = total distance / total time

total distance=1/3+2/3=1

total time=1/3*12+2/3*8

=4/36

=1/9

avg speed=1/1/9=9km/h