***The starting the quality not so good***

Question 8)

A man took 4 1/2 hours to drive 360 km from Singapore to Kuala Lumpur. He used 37.5 litres of petrol for the entire journey.

- Find his average speed.

total distance:360km

total time :4 1/2

360km/4 1/2 = 80km/h

so the average speed of the whole journey is 80km/h

- Find the petrol consumption rate in km/l

total distance : 360km

litres : 37.5 l

360 / 37.5l which is 9.6km/l

so the rate is 9.6km/l

- He drove an average speed of 110 km/h on a highway for 2 hours during his

journey. Find his average speed for the remaining part of his journey.

remaining distance:360km ÷ (110km/h x 2h) = 140km

Choy Rui Zhi

Choy Rui Zhi

remaining time : 4 1/2 - 2 h = 2 1/2

140km/2 1/2 h = 56km/h

so 56 km/ h is the average distance for the remaining part of the journey.

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