172. A goods train crosses 2 km long bridge in
3 min. If length of the train is half of the bridge,
then find the speed of the train:
a. 45 km/hr.
b. 40 km/hr.
c. 80 km/hr.
d. 60 km/hr.
Answers
Answered by
4
Answer:
60 km/ hr
Step-by-step explanation:
length of the bridge = 2 km
time taken to cross the bridge = 3 min
3 min = 3 /60 = 1 / 20 hrs
length of the train = half of the bridge
= 1 km
To cross the bridge of length 2 km by 1 km long train
total distance traveled by the train = length of the bridge + length of the train itself
total distance traveled = 2 + 1 = 3 km
speed = total distance ÷ time
speed = 3 km ÷ 1/20 hr
= 3 × 20
= 60 km/hr
Answered by
0
Answer:
60
Step-by-step explanation:
3/60=1/20
2+1=3
1/20÷3=60
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