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Math Help - primary 6 problem sum

  1. #1
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    primary 6 problem sum

    Belle was travelling in the MRT. She was seated at the last seat of the last coach.During the journey,she noted the time on her watch was 12.18 P.M when the train just entered an underground tunnel.The moment she exited from the tunnel,the time was 12.23 P.M.Given that the train travelled at an average speed of 18 km/h and that the tunnel is 1350m long,find the length of the train in metres.
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  2. #2
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    Distance = Rate * Time

    What else do you need?

    Rule #1 - Name Stuff.
    Question #1 - Name what?
    Answer #1 - What does it want? Name that.

    L = Length of train in metres.
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  3. #3
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    Quote Originally Posted by mytan1963 View Post
    Belle was travelling in the MRT. She was seated at the last seat of the last coach.During the journey,she noted the time on her watch was 12.18 P.M when the train just entered an underground tunnel.The moment she exited from the tunnel,the time was 12.23 P.M.Given that the train travelled at an average speed of 18 km/h and that the tunnel is 1350m long,find the length of the train in metres.
    Notice: 18\frac{km}{h} =5\frac{metres}{second}
    time=5min=5\cdot 60sec=300sec

    (length of the tunnel)+(length of the train)=speed\cdot time
    (length of the train)=speed\cdot time - (length of the tunnel)
    (length of the train)=300sec\cdot 5\frac{metres}{second}  - 1350m=1500m-1350m=150m

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