Question

A racing car travels 425 m in 10 sec ; express this speed in km per hour

Answer 1

Answer:

it travels 425m in 10 sec

so 42.5m is covered in 1sec

so speed is 42.5m/s

or 42.5×18/5 kmph

or153kmph

Answer 2

${ \huge{ \bold{\underline{ \underline{ \red{Solution:-}}}}}}$

${ \large{ \bold{\underline{ \underline{ \blue{Given:-}}}}}}$

● Distance travelled = 425 m

● Time taken = 10sec

${ \large{ \bold{\underline{ \underline{ \green{To \: Find:-}}}}}}$

● Speed = ?

${ \large{ \bold{\underline{ \underline{ \orange{Formula \: used:-}}}}}}$

$\large\implies{\tt{S = \frac{d}{t}}}$

Where,

S = speed

d = distance travelled

t = time

${ \large{ \bold{\underline{ \underline{ \blue{Calculation:-}}}}}}$

$\large\leadsto{\tt{S = \frac{d}{t}}}$

$\large\leadsto{\tt{S = \frac{425}{10}}}$

$\large\leadsto{\tt{S = 42.5km/hr}}$

$\large\leadsto{\tt{S = 4.25 ×\frac{18}{5}}}$

$\large\leadsto{\tt{S = 153 kmph^-1}}$