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Let speed of A and B be ‘x’ km/h and ‘y’ km/h respectively.
According to question;
84/x – 84/y = 1…………………..(1)
And, 84/y – 84/2x = 5/2…………………(2)
From equation (1) and (2) we get
84/x – 1 – 84/2x = 5/2
42/x = 5/2 + 1 = 7/2
x = 12
So, y = 14 km/h
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