Question

A motorcycle is moving at a constant speed of 40km/h. How long does it take the motorcycle to travel a distance of 10km?

Answer 1

time = distance/time
time(hours)= 10/40
time(hours)=0.25
=15 minutes

Answer 2

Considering the definition of speed, it takes the motorcycle 0.25 h (15 minutes) to travel a distance of 10 km.

First, you have to know that speed ​​is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

$speed=\frac{displacement}{time}$

In this case, you know that:

• speed= 40 $\frac{km}{h}$
• displacement= 10 km
• time= ?

Replacing in the definition of speed:

$40 \frac{km}{h} =\frac{10 km}{time}$

Solving:

40 $\frac{km}{h}$× time= 10 km

time= 10 km÷ 40 $\frac{km}{h}$

time= 0.25 h= 15 minutes (being 1 h=60 minutes)

In summary, it takes the motorcycle 0.25 h (15 minutes) to travel a distance of 10 km.

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