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In 15 mins time, John and Bala passed by each other and were 10km a part.

Therefore, total distance traveled by both in 15 mins will be 35km + 10km = 45 km.

Combined speed for both will be,

45km/ 15 min = 3 km/min or 180 km/hr.

Bala’s speed will be,

(180 – 16)/2 km/hr+ 16 km/hr = 98 km/hr.

 

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