Question

It takes 90 seconds for a pump to fill up a car tyre. How many hours would it take to fill every tyre on a convoy of 60 vehicles?

Answer 1

Step-by-step explanation:

Assuming all the tyres take the same amount of time and have 4 tyres;

Time taken to fill one tyre = 90 seconds

Time taken to fill four tyres = 90 × 4 = 360 seconds

Time taken to fill up every tyre in 60 vehicles = 360 × 60 = 21,600 seconds = 6 hours

Answer 2

Step-by-step explanation:

Assuming all the tyres take the same amount of time and have 4 tyres;

$Time \: taken \: to \: fill \: one \: tyre \: = 90s \: seconds$

$Time \: taken \: to \: fill \: four \: tyres$

= 90× 4=360sec

Time taken to fill up every tyre in 60 vehicles

$\rightarrow \fcolorbox {blue}{green} {360 × 60 = 21, 600 seconds } \\ \rightarrow \red {6hours}$