Question

If a marathon runner runs a distance of 5 km (kilometers) in 45 minutes. What is his speed?

Answer 1

Given parameters:

Distance = 5km

Time taken = 45 minutes

Unknown:

Speed = ?

Solution:

Speed is a physical quantity.

It is given as;

Speed =
`(distance)/(time)`

Since the unknown is speed;

convert the time given to hours;

60min = 1hr

45min =
`(45)/(60)` =
`(3)/(4)hr`

So, speed =
`(5)/((3)/(4) )` = 5 x
`(4)/(3)`

=
`(20)/(3)`km/hr