Mr Goh was travelling from Town X to Town Y. After completing 2/7 of the journey, he passed by Mr Lee travelling the same direction. Mr Lee was travelling at an average speed of 60 km/h. Mr Goh reached his destination 3 hours later, while Mr Lee was still 45 km away from Town Y.
(a)Find the distance between the two towns.
(b)If Mr Lee left Town x at 11.30 am, what time would he arrive at Town Y?
Solution
(a)
(Goh) 5/7 of journey ----- 225 km
1/7 of journey ----- 225 km 5 = 45 km
(Whole journey) 7/7 ----- 45 km x 7 = 315 km
Answer: 315 km
(b)
Lee’s time ----- distance divided by speed
315 km divided by 60 km/h
= 5.25 hours or 5 hours 15 min
Since Lee left at 11.30 am, he would arrive at 4.45 pm.
Answer: 4.45 pm
Wednesday, September 09, 2009
Anglo Chinese School 2007 PSLE Math Prelim Q48
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1 comment:
think this is a good speed question.hope more questions will be posted.a kind request.pls make thoe diagram clearer.
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