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Fixed route, new time: new speed, change in speed or time saved

This type of question, asked 4 times: 21 Jul 2023 S2, 13 Sep 2025 S2, 14 Sep 2025 S1, 15 Sep 2025 S3. All 4 questions below, oldest first.

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  1. Question 1

    21 Jul 2023 S2

    51
    The distance between two towns is covered in 7 hours and 30 minutes at the speed of 72 km/h. The time saved if the speed is increased by 25%25\% is:

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  2. Question 2

    13 Sep 2025 S2

    69
    An airplane travels a specific distance at a speed of 240 km/h over the course of 5 hours. To cover the same distance in just 1 hour, it needs to fly at a speed of:

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  3. Question 3

    14 Sep 2025 S1

    68
    A cyclist travels from City A to City B at an average speed of 20 km/h and takes 4 hours. If they want to complete the same journey in 2.5 hours, by what amount (in km/h) should they increase their average speed?

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  4. Question 4

    15 Sep 2025 S3

    68
    A delivery van travels at a constant speed of 60 km/h to cover a certain route in 1 hour and 45 minutes. If traffic increases the time taken by 15 minutes, by what percentage must the van's average speed decrease to complete the route?

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