Two equal distances at two speeds: average speed

The same question, asked 3 times: 21 Jul 2023 S4*, 25 Jul 2023 S2*, 26 Sep 2025 S2. Every wording below, oldest first.

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Question 1
21 Jul 2023 S4
75 $A car travels the first 160 km at a speed of 64 km/h and the next 160 km at a speed of 80 km/hr What is the average speed for the first 320 km of the tour?$
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Question 2
25 Jul 2023 S2
59 $Ramesh, on his way to his hometown, travelled the first 250 km at a speed of 75km/h and the next 250 km at a speed of 85 km/h. Find the average speed for the whole journey(correct to 2 decimal places).$
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Question 3
26 Sep 2025 S2
66 $A train travels the first 100 km at 50 km/h and the next 100 km at 25 km/h. What is the average speed for the total journey?$
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Question 1