the length of the train is 140m and its speed is 72km/hr.how long will it take to cross the following.
a) a pole?
b) a platform of 220m long
Answers
Answered by
0
Answer:
a) 2800 second
b) 4400 second
Step-by-step explanation:
a)
Speed = 72 km/hr = 20 m/s
Distance = 140 m
- Time to cross pole = Speed×distance
= 140× 20
= 2800 second
b)
Speed= 20 m/s
Distance = 220 m
Time to cross platform = distance × speed
= 220 × 20
= 4400 sec
Answered by
1
Given:
The length of a train is 140m and it's speed is 72km/hr.
Find:
How long will it take to cross. A pole 220m long.
Calculations:
Distance = 220 + 140.
Distance = 360.
Using formula:
Distance/Speed × Time is equal to 1.
⇢ 1000/60
⇢ 72/1
⇢ 7200/60
⇢ 1200/1
⇢ 20/1
⇢ 360/20 × Time = 1
⇢ Time = 18
Therefore, 18 sec is the required answer.
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