A train covers half of its journey with a speed of 30 m/s and other half with speed of 40 m/s. Calculate it's average speed for the entire journey?
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Explanation:
let d be the distance of journey
now at speed of 30 m/s
it covers d/2 m in time T1
so 30 = d/2T1
T1 =d/60
now it covers at 40 m/s in T2
similarly T2=d/80
total time =T1+T2= d/60+d/80
= 14d/48
= 7d/24
total distance =d
average speed = d/7d ×24
=24/7 m/s
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Answer:see the photo.If cannot understand then ask me.
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