Question

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

Answer 1

Answer:

Option B 120 kilometer per hour

Answer 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