A man having to drive 90 KM wishes to achieve an average speed of 30 KM per hour. For
the first half of the journey, he averages only 20 KM per hour. What must be his average
speed for the second half of the journey if his overall average speed is to be 30 KM per
hour?
Answers
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0
Answer:
1km/min
Step-by-step explanation:
Time taken to travel the first half of the journey =
20
45
hrs=
4
9
hrs
Total time = 3 hrs
∴ Time left for the second half of the journey =(3−
4
9
)hrs=
4
3
hrs
Distance to be covered = 45 km
∴ Required speed =
4
3
45
km/hr
=60km/hr=1km/min
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