Question

A bus travels a distance of 180 km with a speed of 60 km/hr and returns with the speed of 30 km/hr. Calculate the average speed for the entire journey

Answer 1

Explanation:

Distance=180km

speed=60km ph

returns=30kmph

speed =distance travelled /time taken

60=180/t

t=180|60

t=3 hours

for entire journey

returning in 30kmph

speed= distance travelled /time taken

30=180/t

t=180/30

t=6hours

total journey time is 3+6 = 9 hours, at the speed of 30 +60=90 kmph.

Answer 2

Answer:

40km/hr

Explanation:

T=D/S

180km/60km\hr=3hrs

180km/30km\hr=6hrs

[180+180]km=360km

[3+6]hr=9hr

S=D/T

360km/9hr

40km\hr