David's average driving speed for 5 hours journey was 55 km/h . During his first two hour 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?
Answers
Answered by
4
Answer:
Average Speed is 55 km/h
Combined Time is 5 hours
Combined Distance is 275 km.
2 hours x Speed is 60 km/h,
Time is 2 hours, Distance is 120 km.
Step-by-step explanation:
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Answered by
22
Answer:
55 km/h
Step-by-step explanation:
Total distance = avg. speed x time = 55 x 5
Total distance = 275 km
Let speed in 5th hour be V
Breaking up into intervals, total distance will remain the same:
(60 x 2) + (50 x 2) + ( V x 1) = 275
120 + 100 + V = 275
V = 275 - 220
V = 55 km/h
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