Question

A boy takes 20 seconds to reach each point from A to B, B to C and C to D as shown in the diagram. If AB = BC = CD = 40 m then which of the following information is correct when the boy reaches point D from point A?

Answer 1

Speed = total distance/totaltime

Speed = 20+20+20/5+5+5

Speed =60/15

Speed = 4 m/s.

Answer 2

Explanation:

$\frac{\bf\red{TotalDistance}}{ \bf\red{Time taken}}$

$\bf\red{Speed} =\sf\dag \frac{20 + 20 + 20}{5 + 5 + 5}$

$\bf\green{Speed} =\sf\dag \frac{60}{15}$

$\bf\purple{Speed} = 5ms$