Math, asked by aundram8411, 9 months ago

A train 300 m long crossed a platform 900m long in 1 minute 12 second the speed of the train in km/hr was?

Answers

Answered by Princessofdarknzz

3

Answer:

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Answered by Cosmique

5

$\large{ \underline{ \bf{ \color{blue}Question}}}$

A train 300 m long crossed a platform 900 m long in 1 minute 12 second the speed of the train in km/hr was?

$\large{ \underline{ \bf\color{red}Answer}}$

Total distance covered = (300 + 900) m

total distance covered = 1200 m

[*(we are adding the length of train and platform because platform will be considered crossed only when train's full length will cross the platform) ]

Total time taken = 1 min 12 sec

total time taken = 72 sec

$\boxed{ \bf{speed = \frac{total \: distance}{time \: taken} }}$

so,

$\mathrm{speed \: of \: train = \frac{1200}{72} \: \: m {s}^{ \tiny{ - 1}} }$

$\bold{ \mathrm{speed \: of \: train = \frac{50}{3} \: \: m {s}^{ \tiny{ - 1}} }}$

To change the speed in m/s into km/h

multiplying the speed in m/s be 18/5

$\mathrm{speed \: of \: train = \frac{50}{3} \times \frac{18}{5} \: \: km {h}^{ \tiny{ - 1}} } \\ \\ \boxed{ \bf{ \color{red}speed \: of \: train = 60 \: km {h}^{ \tiny{ - 1}} }}$

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