A. 27 km/hr
B. 49 km/hr
C. 72 km/hr
D. 92 km/hr
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
72 kmph
A 260 meter long train crosses a 120 meter long wall in 19 seconds. What is the speed of the train?
Speed=Distance/Time
Distance=length of train+ length of wall(260+120)
so, Distance=380m
Time=19 sec
Speed=380m/19 sec
=20m/sec
in the options it is in km/hours so by converting we get
20m/sec*18/5=72km/hr
49 km /hr
Total Distance Cover by the train in 19 sec = 260+120=380 meter
speed of train is (380 * 3600)/19=72000meter/h
Km/h=72000/1000=72km/h
c
A
72km/hr
72 km/hr
72 km/hr
length of train=260
length of wall=120
length=260+120=380
t=19s
s=380/19*18/5=72 km/h
72
C
72
t=d/s
(260+120)/19
20*18/5=72
72
t=d/s
(260+120)/19
20*18/5=72
72
72 km/hr
Answer is 72km/hr
Solution
Speed=distance*time
Here distance = 360(length of the train + length of the bridge)
Speed =360*19*(18/5) here(18/5) is used for converting m/s to km/hr
Speed =72km/hr
49km/hr
72
20 m/secĂ—18/5=
=72kmph
72km/hr
C. 72 KM/Hour
The length of the train L is 260 Mts and the length of the wall is 120 Mts which we call it as D and the time T taken is 19 Secs
Speed in Mts/Sec = ( L + D)/T = (260 + 120)/19 = 380/19 = 20M/S
Converting the same to hours per km
20 * 3600 = 72000 Mts/Sec = 72000/1000 = 72 Kms
72kmph
72
total dis=380
time taken to travel=19 sec
S=d/t
s=380/19
=20
to covert m/s to km/per we have to multiply with 18/5
so 20m/s in km/h is
20m/s=20*18/5=72km/hr
72
260+120=380 m
time=19 s
speed= 380/19 m/s=20 m/s
in km, speed= (20*3600)/1000 [ 1 hour= 3600 s]
72
260+120/19
20m/s
also 72kmph
72
72
72km/hr
B. 49
380/19=20 m per sec.
72.. ho my.
1
72km/hr
72km/hr
C
72km/hr
72km/hr
72
C. 72 km/hr
B
Total distance = 260+120=380m
Time = 19sec
Speed of train in (m/sec) = total distance/ Time
= 380/19=20m/sec
Convert m/sec to km/hr. Short cut(*ly 3.6)
20*3.6= 72
I understand the above answers but when the train has to completely pass the 120 m wall/tunnel, shouldnt the end of train be at the rear end of tunnel? which means distance = 260 + 120 + 260?
Total Distance = 260+120=380
Time = 19
Speed of Train = (380/19) x (18/5) => 40 K/hr
72
length of train = 260 meters
length of wall = 120 meters
Total length = 380 meters
Remember your answer is in km/hr
so convert length to km by dividing by 1000
Hence total length = 380/1000 =0.38
Time is 19 seconds, convert to hr by dividing by 120
19/120 = 0.00528 hr
Speed =distance/time……………0.38/0.00528 =71.97km/hr
19/3600 =0.00528
3600 seconds give 1hour
72km/hr
length of the train is = 260 m
length of the platform is = 120m
so total length is = 380m
and time taken is = 19s
so v = 380/19
v = 20m/s
72 kmph
train’s length=260m
wall=120m
time=19sec
speed=distance/time
distance=train’s length+ wall’s length
so, speed=(260+120)/19=20m/s
in kms, speed=20*(18/5)=72Km/hr
72
A