Question

A train 150 m long cross a tree in 6 seconds . what is the speed of the train in km per hour?

Answer 1

The speed of the train=150/1000÷6/3600=150/1000×3600/6=90 km/hr .

Answer 2

Speed  =  90 km/hour.

Step-by-step explanation:

The distance in km

• 1000m= 1km
• 150m =  $\frac{150}{1000}$ km

The time in  Hours

•  3600 sec = 1 Hour

• 6sec = $\frac{6}{3600}$ hour.

Speed = Distance ÷ Time

$= \frac{150}{1000}$ ÷ $\frac{6}{3600}$

$=\frac{150}{1000}$ × $\frac{3600}{6}$

$=\frac{150}{1000}$ × $600$

$= \frac{90000}{1000}$

Speed  =  90 km/hour.