Can help my DD on this question ?
John left Admiralty Town at 11.30 am for Bukit Town which was 35 km away. At the same time, Bala left Bukit Town for Admiralty Town . Bala’s speed was 16 km/h faster than John’s speed. They travelled along the same route. Fifteen minutes later, they were 10 km apart, after passing each other. find Bala’s average speed.