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A <——X———>B

1.2km/hr x 1/2 hr = 0.6km

At the starting point of X, A abd B jog in opposite direction.

After 1/2 hr, B jog further by 0.6km. Total distance apart is 5.2km

(5.2 km-0.6km)/2 = 2.3km

In 1/2 hr, A  jog 2.3km, so his average speed will be 4.6km/hr.

 

 

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