Question

A boy starts running from his house with a
uniform speed and takes 1 hour to reach the
play ground. If the distance between his house
and the play ground is 3.6 km, calculate the
his speed in km/h, m/s and cm/s​

Answer 1

Given

● Time taken = 1 hour

● Distance b/w house & playground = 3.6 km

To find

● Speed in km/h, m/s & cm/s.

Solution

☢ Speed in km/h :

Here distance (d) = 3.6 km.

Time (t) = 1 hour

We know that,

● Speed = Distance/Time

⇒ Speed = 3.6/1

⇒ Speed = 3.6 km/h

∴ Speed of boy in km/h = 3.6 km/h

☢ Speed in m/s :

Distance = 3.6 km

= (3.6 × 1000) m

= 3600

Time = 1 hour

= (1 × 3600)s

= 3600 s

☢ Using same formula :

⇒ Speed = 3600/3600

⇒ Speed = 1 m/s

∴ Speed of boy in m/s = 1 m/s

☢ Speed in cm/s :

Distance = 3.6 km

= (3.6 × 1000 × 100) cm

= 360000 cm

Time = 3600 s

☢ Using same formula :

⇒ Speed = 360000/3600

⇒ Speed = 100 cm/s

∴ Speed of boy in cm/s = 100 cm/s