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

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