**Important Formula:**

m/s——->km/h=> km/h—–>m/s=>

Average speed=

Average speed=

**Problem 1:** A car driver travels from the plains to the hill station which is 200km apart at an average speed of 40 km/h in return trip he covers the same distance at an average speed 20 km/h the average speed of the car over the entire distance of 400km?

Solution:

Average speed==

**Problem 2:** During a journey, a man covered 50 km at a speed of 25km/hr. He covered the remaining 70km at a speed of 35km/hr. Find the average speed of the man?

Solution:

50km———>25km/hr———>

70km———>35km/hr——–>

Average speed==

**Problem 3:** A man covered rd of his at a speed of 20km/hr, th of remaining at the speed of 25km/hr, and the remaining journey at a speed of 30km/hr. Find the average speed of the man?

Solution:

——–>20km/hr

——–>25km/hr

Remaining———>30km/hr

Assume distance is 300 which is divisible by 3 and 4

5+2+5=12

Average speed =