David's average driving speed for 5 hours journey was 55 km/h. During his first two hours of journey,
he drove at 60 km/h, and last two hours he drove at 50 km/h. What was his speed for the fifth hour of the
journey?
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Answer:
David's average driving speed for 5 hours = 55km/h
During his first 2 hours of the journey he drove = 60km/h
last 2 hours = 50k/h
total distance he travelled = 55 * 5 = 275 km
fifth hour = 275 - 60 * 2 + 50 * 2 = 275 - 120 + 50*2 = 275 - 120 + 100 = 275 - 220 = 55 km
His speed for the fifth hour was 55 km/h.
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