Question

a bus covered a distance of 120km in 2 1/2 hours find its speed

Answer 1

Speed of a body is the distance covered by the body in unit time.

Therefore Speed=  which implies:





1. In order to find speed, if :

Distance is in metre (m) and time in second (s); then the speed is in metre per second (m/s)Distance is in Km (Km) and time in hour (h); then the speed is in Kilometer per hour (Km/h)

2. In order to find the distance, if:

Speed is in metre per second (m/s); time must be in second .Speed is in Kilometer per hour (Km/h);time must be in hour

Answer 2

Distance =120km
Time =2½ hour
=5/2hours
$speed = \frac{distance}{time}$
$speed = \frac{120}{ \frac{5}{2} }$
$speed = \frac{120}{1} \times \frac{2}{5} = 48kmh$