Question

Aakash ran 500 metres in 100 seconds .Find her speed in km per hour

Answer 1

we know s=d/t

=>s=500/100

=>s=5m/sec

here we have  to convert into km/hr.Hence we have to multiply answer with 18/5

=>s=5*(18/5)

=>s=18km/hr is ur answer

Answer 2

Given:

distance = 500 m

time = 100 s

Speed = distance / time

==> 500 m / 100 s

But 500 m = 500 /1000 km

= 0.5 km

100 s

Now 1 s = 1 / 60 minute

= 1 / ( 60 * 60) hr

1/3600 hr

100 s is 100 / 3600 hr

==> 1 / 36 hr

So speed

==> 0.5 / 1 / 36 km/hr

==> 36 * 0.5 km / hr

==> 18 km/hr

The speed is 18 km / hr

Hope it helps