Question

A car covers 30km at a uniform speed of 30 km/h . What should be its speed for the next 90 km if the average speed for the entire journey is 60 km/h?​

Answer 1

Answer:

90 km/h

Explanation:

time taken to cover first 30 km is 30/30 = 1h (time = distance /speed )

let the time taken to cover next 90 km is x then

average speed = total covered distance / total time taken

60 = (30+90)/(1+x)

60 (1+x) = 30+90

60+60x = 120

60x = 120-60 = 60

x = 60/60 = 1

now speed = distance / time

= 90 km / 1 h

= 90 km/ h

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