A train travels some distance with a speed of 30km/h and returns with a speed of 45km/h.Calculate the average speed of the train.
Answers
Answered by
715
hi friend, let d/2 be the distance covered by train with a speed of 30kmph in t1 hours
→t1=d/60
it covers d/2 distance with a speed of 45km/h in t2 hours
→t2=d/90
average speed = total distance/total time
=d/(t1+t2)
=1/(1/60+1/90)
=1/(3+2)/180
=180/5=36kmph
I hope this will help u ;)
→t1=d/60
it covers d/2 distance with a speed of 45km/h in t2 hours
→t2=d/90
average speed = total distance/total time
=d/(t1+t2)
=1/(1/60+1/90)
=1/(3+2)/180
=180/5=36kmph
I hope this will help u ;)
sabrinfatimah:
Thanks sis
Answered by
26
Answer: The average speed of the train is 36 kmph.
Explanation:
According to the question,
A train travels some distance with a speed of 30km/h and returns with a speed of 45km/h.
So the average speed of the train.
Let the distance=90km
Speed =
On the first journey, it took hours
On the return journey, it took hours
In total, it took 5 hours for the whole journey.
Total journey: 90+90= 180 km
Speed == 36kmph
Hence, the average speed of the train is 36 kmph.
#SPJ2
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