Question

9. A train 180 m long passes a platform 300 m
long at a speed of 80 km/h. Find the time
taken by the train.​

Answer 1

Step-by-step explanation:

Since the electric pole is a single entity having negligible thickness the time taken by a train 180m long running at a speed of 90km/hr or 90000m/60 min = 180 *60/90000 = 0.12 min or 7.2 sec to pass the pole.

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Answer 2

Step-by-step explanation:

Let l and s be the length of train and speed of train respectively.

now,

Length of platform =300m

Time taken by the train to cross the signal =

Speed of train

length of train

⇒

s

l

=12

⇒l=12s.....(1)

Now,

Time taken by the train to cross the platform =

speed of train

length of train+length of platform

⇒30=

s

l+300

⇒30s=12s+300(From (1))

⇒30s−12s=300

⇒s=

18

300

=

3

50

m/s=

3

50

×

5

18

=60km/hr

Hence the speed of the train is 60km/hr