24. ON 13/P13/09
A person, travelling on a motorway a total distance of 200km, travels the first 90km at an average speed of 80kmh-1.
Which average speed must be obtained for the rest of the journey if the person is to reach the destination in a total time
of 2 hours 0 minutes?
A 110kmh 1
B 120kmh-1
C 122kmhrt D 126kmh-1
Answers
Answered by
2
Answer:
Option B 120 kilometer per hour
Answered by
2
Answer:
D. 126Kmh^-1
Explanation:
total distance = 200km
covered distance = 90km
remaining distance = 110km
90km at 80kmh^-1 = 9/8 hours
remaining time = 16-9/8 hours = 7/8 hours
necessary speed = 110/7/8hours
= 110multiply 8 /7 = 880/7
= 125.5km/h^-1
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