Question

Which is a greater speed of 45 km/h or speed of 12.25 m/sec?
How much is the distance travelled by each in 2 seconds?

Answer 1

First speed = 45 km/h

Second = 12.25 m/sec

= `(12.25xx60xx60)/1000` km/h

= `(1225xx60xx60)/(100xx1000)`

= `441/10`

= 44.1 km/h

It is clear from above that 45 km/h is greater.

distance covered in 2 seconds by 45 km/h

Speed = `(45xx1000xx2)/(60xx60)` = 25 m

and distance covered in 2 seconds by 12.25 m/sec = 12.25 × 2 = 24.50