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## Ardi and Lei are both travelling by train. Ardi’s train travels 70 km in 35 minutes. Lei’s train travels 585 km. It lea

Question

Ardi and Lei are both travelling by train.

Ardi’s train travels 70 km in 35 minutes.

Lei’s train travels 585 km.

It leaves at 9:05 and arrives at 13:35.

Work out the difference, in km/h, between the average speed of their trains.

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Mathematics
3 years
2021-07-29T23:37:57+00:00
2021-07-29T23:37:57+00:00 1 Answers
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## Answers ( )

Answer:

10 kilometer/hour

Step-by-step explanation:

Average speed = Total distance travelled / Total time taken

Ardi:

Total distance travelled = 70 km

Total time taken = 35 minutes = 35/60 hour

Average speed = Total distance travelled / Total time taken

= 70 km ÷ 35/60 hr

= 70 × 60/35

= 4,200/35

= 120 kilometer/hour

Lei:

Total distance travelled = 585 km Total time taken = 9:05 – 13:35 = 4 hours 30 minutes

= 4.5 hours

Average speed = Total distance travelled / Total time taken

= 585 km / 4.5 hours

= 130 kilometer/hour

Difference, in km/h, between the average speed of their trains = Lei’s train – Ardi’s train

= 130 kilometer/hour – 120 kilometer/hour

= 10 kilometer/hour