Answers

  • Brainly User
2014-05-16T18:54:02+05:30
The velocity of the train should be 45.55 km/hr
0
sweety 2..can u plz show with the solving!!
For first 30 km
it would be v = s / t =>30 = 30 / t
t = 1 hr
For next 70 km
let velocity be x
v = s / t
x = 70 / t
t = 70 / x
hence total time taken is 1 + 70/ x = (70 + x) / x
total dist. travelled is given i.e. 100km
hence avg. velovity = total dist / total time
40 = 100 divided by (70 + x) / x
40. (70+x) / x = 100
2800 + 40x - 100x = 0
- 60x = - 2800
x = - 2800 / -60
x = 45.55 km/hr
2014-05-16T21:46:55+05:30
It should be 45.5 km/hr
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