Question

The distance from Antville to Beetleton is 60 km.

Mr. Caterpillar travels from Antville to Beetleton at
an average speed of 30 km/h.
How long does it take him?
On the return journey, his average speed is 20 km/h.
Work out his average speed for the whole journey.
Give your answer to 1 d.p.
Total
12
26
earch
o i

Answer 1

i. Time = 2 hours.

ii. Average speed for the whole journey = 25 km/h

Explanation:

Distance from Antville to Beetleton = 60 km

Mr. Caterpillar's speed = 30 km/h

Speed =
`(distance)/(time)`

⇒ time =
`(distance)/(speed)`

=
`(60)/(30)`

= 2

time = 2 hours

It would take Mr. Caterpillar 2 hours to travel from Antville to Beetleton at that speed.

On his return journey, his average speed is 20 km/h. Therefore;

average speed for the whole journey =
`(30 + 20)/(2)`

=
`(50)/(2)`

= 25

average speed for the whole journey = 25 km/h