On a trip of 60 kilometres, Rita covered the first 15 kilometres at an average speed of 75 kilometres per hour and the following 35 kilometres at an average speed of 140 kilometres per hour. At what average speed did she cover the last part of her trip if her average speed for the whole trip was 80 kilometres per hour?

(A) 3 kilometres per hour

(B) 25 kilometres per hour

(C) 30 kilometres per hour

(D) \(\frac{100}{3}\) kilometres per hour

(E) \(\frac{200}{3}\) kilometres per hour

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