A. 70 km/hr
B. 71 km/hr
C. 72 km/hr
D. 79.2 km/hr
A train 132 m long passes a telegraph pole in 6 seconds. Find the speed of the train
A train 132 m long passes a telegraph pole in 6 seconds. Find the speed of the train
A. 70 km/hr
B. 71 km/hr
C. 72 km/hr
D. 79.2 km/hr
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L =132m convrt to km/hrso, 132×18/5 =475.2 km/ hr
Time=6
Speed=length/ time
Speed =475.2/6=79.2km/hr
132m speed
6s time
speed is in kmph
and 1hr 60 min
i min 60 sec
so 60*60/6=600=t
multiply and divide by 600
132*600m/600*6 sec
79200m/3600 sec
but 3600 sec=60min=1 hr
so
79200m/hr
but 1000m=1km
so
79200/1000=79.2km
so 79.2km/hr is the answer
D
132/6×3600/1000=79.2
132 / 6 = 22 (m/s)
22 x 3.6 = 79.2 (km/h)
The train drive 79.2 km/h
d = 132/1000 = .132
t = 6 / 3600 = .00166
speed = .132/.00166 = 79.2 km/hr
D)79.2 Km/hr
Correct option is
C
79.2 km/hr
Speed of train =
Time taken to pass the pole
Length of train
=
6
132
m/sec=22m/sec=(22×
5
18
)km/hr=79.2km/hr
S=D/t
D=132m
t=6s
(132/6)*(18/5)
=79.2km/hr
S=D/t
D=132m
t=6s
(132/6)*(18/5)
=79.2km/hr
D
79.2
79.2
79.2km/hr
Train length=132m
Time taken = 6s
Speed = length/time
= 132/1000 / 6/3,600
= 0.132/0.00166 km/hr
= 79 km/hr