I need help:


A lorry,25.6m long, travelled through a tunnel at an average speed of 28m/s.The whole lorry took 4min 36s to pass through the tunnel completely.
1min later, Mr Jason drove his car into the tunnel. Both the lorry and Mr Jason’s car reached town Kingston, which was 2km away from the exit of the tunnel, at the same time

a) Find the length of the tunnel.
(Round off answer to nearest whole number)
b) Calculate the average speed of the car in m/s.
(Round off the answer to the nearest whole number)



Thanks!

I need help:


A lorry,25.6m long, travelled through a tunnel at an average speed of 28m/s.The whole lorry took 4min 36s to pass through the tunnel completely.
1min later, Mr Jason drove his car into the tunnel. Both the lorry and Mr Jason’s car reached town Kingston, which was 2km away from the exit of the tunnel, at the same time

a) Find the length of the tunnel.
(Round off answer to nearest whole number)
b) Calculate the average speed of the car in m/s.
(Round off the answer to the nearest whole number)



Thanks!

Thanks.This was from my daughter’s school practice paper.

lizawa:

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xamples of P6 Maths problem sums :

1. David had 2 bags of marbles. After he had sold 44 marbles from Bag X to his friend, the number of marbles in Bag Y was 5/7 of the number of marbles in Bag X. Given that there were 2/5 as many marbles in Bag Y as in Bag X originally, find the number of marbles in Bag X at first.


2. John read a book in 3 days. He read 35% of the total number of pages in the book on the 2nd day. The ratio of the total number of pages of book he read on the 1st and 2nd day to the number of was 11:9. If he had read 75 more pages on the 3rd day than on the 1st day, how many pages of the book did he read on the 2nd day ?

k
Not only must the child be good at Maths, he/she must also be good at English, in terms of interpreting and understanding the question.

3. Mr Tan travelled from Town A to Town B at 1100hrs. When he was 30 km fom Town A , Mr Bala left Town B to Town A at a speed of 18km/h faster than Mr Tan. When Mr Bala reached Town A at 1pm, Mr Tan had completed 90 percent of his journey. What was Mr Tan's average speed?