If a Delhi to Mumbai Rajdhani train running at the speed of 30 m/s and covers 4.2 km long chunk in 7 minutes, then the length of the train is:

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22 Jun 2021 Train & Speed If a Delhi to Mumbai Rajdhani train running at the speed of 30 m/s and covers 4.2 km long chunk in 7 minutes, then the length of the train is:: OPtion
1) 8.2 km
2) 8.6 km
3) 8.4 km
4) 7.8 km
5) 7.4 km
6) 9.0 km
7) 9.2 km
8) 9.4 km
9) 8.8 km
10) None of the above; Correct Option: 3 Best Solution (5)

G.S.Kantharao 3 years AGO

In 7 minutes the train travels with a speed of 30m/s it travels = 4200*30=12.6 Km
Chunk Length =4.2Km
Train Length= 12.6-4.2=8.4 Km
Hence my option is 3 👈

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SAYAN CHATTERJEE 3 years AGO

(4200+x)/30= 7*60
x= 8.4 km.
Option 3.

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Chinmay Swarup Chiranjeevi 3 years AGO

s = d/t
30 = (4200 + x)/420
x = 8400
length of train = 8.4 km

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RAMADURAI NATESAN 3 years AGO

let length of train = L metres.
It covers 30 m in 1 second
It will cover L + 4200 m in ( L + 4200 ) / 30 s = 420 s.
Solving , L = 8400 m 0r 8.4 km

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MANISHA JADHAV 3 years AGO

Distance cover in 7m that is in 420s is =12600
but chunks length is 4.2km=4200m
length of train=12600-420=8400m=8.4km

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If a Delhi to Mumbai Rajdhani train running at the speed of 30 m/s and covers 4.2 km long chunk in 7

M4maths Previous Puzzles

22 Jun 2021 Train & Speed