21. A train travelling at a uniform speed passes by a platform 220 m long in 30 s and another
platform 325 m long in 39 s. Find (1) the length of the train and (ii) the speed of the train.
Answers
Answer:
a train travelling at a uniform speed passes by a platform 220 M long in 30 seconds and another platform 325 M long in 39 seconds find the length of the train and the speed of the train
Step-by-step explanation:
1
A train traveling at a uniform speed clear a platform 200 m long in 10 seconds and passes a telephone post in 5 seconds. What is the speed of the train?
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Keisha
Answered August 19, 2018
Let length of the train be (x) m
When the train passes the platform
Distance covered would be length of the platform + length of the train.
D = 200 + x
T = 10 se.
S = d/t
=200 + x / 10
Hence the first eq. Is formed.
Similarly, when the train passes the telephone post.
The total distance covered would be equal to the length of the train. Here we neglect the width of the post because it is too small and has a neglegible effect on the value.
D = x
T = 5 sec
S= x/5 ….. eq. 2
Equating eq. 1 and 2 we get,
200 + x = 2x
X = 200m
Putting the value of x in eq. 2 will give us the speed of the train. Therefore,
Speed of the train = 40 m/s
Hope found me helpful.