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Question 1 of 3
A hot air balloon flew from point D to point E which was located 130 km away.
For the first 30 km of the journey, it flew at an average speed of 15 km/h.
It's speed was decreased by 2.5 km/h due to a change in weather conditions and it flew the rest of the journey at this speed.
What was the average flying speed of the balloon for the whole journey ?