Question

If the wheel of a engine of a train is 4 2 /7 m in a circumference and it make a 7 revolution in 4 second find the speed of the train

Answer 1

Hey mate ^_^

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Answer:
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Circumference of the wheel of the engine

$=4 \frac{2}{7}$

$= \frac{30}{7} m$

Distance covered in 4 seconds

$=\frac{30}{7} \times 7$

$= 30m$

Distance covered in 1 second

$=\frac{30}{4}$

$= 7.5m/sec$

Speed

$= 7.5 \times 3600 \div 1000$

$= 7.5 \times \frac{18}{5}$

$= 27km$

Therefore,

The speed of the train is 27 km/hr.

#Be Brainly❤️

Answer 2

$\huge \bf{ \red{hey}}$

$\huge{ \mathfrak{here \: is \: answer}}$


$\bf{ \green{given}}$
$\sf{ \blue{ circumference = }}$
$\bf{ \pink{4 \frac{2}{7} m}}$


hence


circumference=
$\sf{ \frac{30}{7} }$


the revolution in 4 sec= 7

hence the

distance covered in 4 sec=
$\bf{ \frac{30}{7} \times 7}$
$\bf{ = 30m}$


now distance covered in 1 sec

$\bf{ \frac{30}{4}}$


$\bf{7.5m}$

convert it into km/hr


hence

$\bf{7.5 \times \frac{18}{5}}$

$\bf{ \frac{75}{10} \times \frac{18}{5} }$


$\bf{ = 27km | \: hr}$
$\huge \boxed{ \boxed{ \boxed{ \boxed{ \boxed{ \boxed{ \blue{hope \: it \: helps}}}}}}}$

$\huge{ \mathfrak{thanks}}$