# On a 60km straight road a bus travels the 30km with a uniform speed of 30km/h. How much fast the bus travels the next 30km. So as to have average speed of 40km/h for the entire trip?

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The Brainliest Answer!

av. speed=total distance/total time---------------------(1)

av. speed=40 km/hr

total distance=60 km/hrs

let take t₁ as time taken for first 30 km and t₂ for last 30 km

speed =distance/time , time=distance/speed-------------------------------(2)

t₁=30/30=1 hrs

putting in formula (1)

40=60/1+t₂

1+t₂=60/40

1+t₂=3/2

t₂=3/2-1=3-2/2=1/2 hrs

putting value of t₂ in formula----------(2)

1/2=30/required speed

required speed=30×2=60 km/hr