Answer / sindu.m

The answer is 150m.
Let the length of the train be x metres and its speed by y
m/sec.

Then,
x/y = 15 => y = x/15 .
Therefore
(x + 100)/25 = x/15
=> 15(x + 100) = 25x
=> 15x + 1500 = 25x
=> 1500 = 10x
=> x = 150 m.

Answer / ashutosh

we conclude that 10 seconds is used to travel 100 m, sppeed
id 10m/s, (total time to pass pole)*(speed) is its length
means 150 m

Answer / sabih

if we consider the length of the train to be x meters and the speed of the train be ykm/h then the time taken by the train to cross the electric pole =x/y which equals 15(given).now as we proceed ,we know that the length of the platform is 100 meters so,
100+x/25=x/15
15(x+100)=25x
15x+1500=25x
15x-25x=1500
-10x=1500
x=-150 meters,
which we can consider as 150 meters.
this question was also provided in the vidya mandir entrance exam.hope you liked my answer!

Answer / binesh nambiar c

Sorry for the previous
post. The answer is 150

Answer / rohit singh

Let the length of the train is x meter and Speed of the train is y meter/second
Then x/y = 15 [because distance/speed = time] 
=> y = 15/x

=>(x+100)/25=x/15
x=150 meters

So length of the train is 150 meters

Answer / binesh nambiar c

Length of the platform
is 100m. So the train
needs to traval 200m
to cover the station
(when the train travals
100m its fully inside
the station)

it took 25s to cover
this distance. So speed
of train is
200m/25s=8m/s

consider pole dont
have width or consider
it as a point

train took 15 second to
cover that

so length of train=8m/
s*15s=120m

Answer / venkat

60 m

9.An employee has to allocate offices to 6 staff members. The offices are no. 1-6. the offices are arranged in a row and they are separated from each other by dividers>hence voices, sounds and cigarette smoke flow easily from one office to another Miss R needs to use the telephone quite often throughout the day. Mr. M and Mr. B need adjacent offices as they need to consult each other often while working. Miss H is a senior employee and his to be allotted the office no. 5, having the biggest window. Mr. D requires silence in office next to his. Mr. T, Mr. M and Mr. D are all smokers. Miss H finds tobacco smoke allergic and consecutively the offices next to hers are occupied by non-smokers. Unless specifically stated all the employees maintain an atmosphere of silence during office hrs. a. The ideal candidate to occupy office farthest from Mr. B will be i. Miss H ii. Mr. M iii. Mr. T iv. Mr. D b. The three employees who are smokers should be seated in the offices i. 1 2 4 ii. 2 3 6 iii. 1 2 3 iv. 1 2 3 c. The ideal office for Mr. M would be i. 2 ii. 6 iii. 1 iv. 3 d. In the event of what occurrence within a period of one month since the assignment of the offices would a request for a change in office be put forth by one or more employees? i. Mr D quitting smoking ii. Mr. T taking over duties formally taken care of by Miss R iii. The installation of a water cooler in Miss H’s office iv. Mr. B suffering from anemia

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