A bus between Vijayawada and Hyderabad passed the 100 km,160-km and 220-km points at 10.30 a.m., 11.30 a.m. and 1.30 p.m. Find the average speed of the bus during each of the following intervals:
(a)10.30 a.m. to 11.30 a.m. (b)11.30 a.m. to 1.30. p.m., and (c)10.30 a.m. to 1.30 p.m.

Explanation

The distance covered between `10.30 a.m "and " 11.30 a.m =160km=60km `
The time interval =`11.30-10.30`=1 hour
The average speed during this time interval `=v_(1)=(60km)/(1h)=60km//h`.
The distance covered between `11.30a.m "and"1.30p.m =220km-160km=60km`
The time interval =1.30 p.m .-11.30=2 hours
the average speed during this time interval =`v_(2)=(60km)/(2h)=30km//h.`
The distance covered between 10.30 a.m to 1.30p.m.=220km-100km=120km.
The time interval `=1.30p.m.-10.30 a.m=3` hours
The average speed during this time interval `=v_(3)=(120km)/(3h)=40km//h`.