A train of length 150 m takes 40.5 seconds to cross a tunnel of length of 300 m. The speed of the train (in km/hr) is

A. 13.33

B. 26.67

C. 38.32

D. 40

Since the total train length passed the tunnel so the distance would be the length of train added to the tunnel legth
D=150+300=450 mt.
speed = distance/time
speed = 450/(40.5/3600)
speed =40,000 mt/sec

Total Distance Covered By the train = 300 + 150 = 450
Speed of trin in Km = (450*3600)/(40.5*1000)=40 km/h

40

Go oc cho
https://vtc.vn/noi-that-go-oc-cho-tan-co-dien-morehome-lan-gio-moi-cho-thi-truong-viet-nam-ar665386.html

40

40km/hr

40

total distance = 150 + 300 = 450m
Time = 40.5s

Distance in km = 450/1000 = 0.45km
Time in hr = 40.5/3600 = 0.01125hr
Speed = distance/time => 0.45/0.01125 => 40km/hr

length of train + tunnel length = total distance
300+150=450
Speed =distance / time
= 450/40.5
It’s was in meter/ second form. We need to convert it into km/hr. So we multiple with 3.6(i.e 3600/1000)
=450/40.5*3.6
=40 km/hr

40

13.33
total distance pased by train is 150m
because, = tunnel length-train length
=300-150
=150m
d=0.15km t=0.01125

a=d/t
=13.33

D. 40

40 kmph