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speed of —
Angie : 1u
Tom : 1u + 20

9.30 am to 11.30 am ——- 2h (time Angie took to reach meeting point)
10.30 am to 11.30 am ——- 1h (time Tom took to reach meeting point)

1u x 2 = 2u ——- (1u + 20) x 1 = 1u + 20
2u – 1u = 1u ——- 20

Ans : 20 km/h.

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