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Explanation:

Let AB = BC = CD = 30 kms

Time taken from A to B = 30/5 = 6 hours.
Time taken from B to C = 30/10 = 3 hours.
Time taken from C to D = 30/15 = 2 hours.

∴ Total time taken = 6 + 3 + 2 = 11 hours.
Total distance travelled = 90 kms

Average speed = 90/11 = 8(2/11) kmph.

Hence, option (a).

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