How do I solve this word problem and what is the answer?

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Question description

Emilio left Cross Street at 8:30 a.m. and arrived at Summer Lane at 1:30 p.m. His average speed for the whole journey was 60 km/h. For the first 60% of the trip, he drove at an average speed of 90 km/h.  For the next 25% of the remaining trip, his average speed was 60 km/h. Find the average speed for the remaining part of the trip. (Hint: Draw a labeled picture on scrap paper and use the formula D=RT)

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(Top Tutor) Daniel C.
School: New York University
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