Answers

2015-06-01T16:57:51+05:30
Distance=s=1384 km
time interval= 4:00 pm to 9:00 am
Let 4:00 pm be 1 hr.
After 12 hours half of the day is complete. So, after 12 hours the time would be 4:00 am. But, the final time is 9:00 am and time difference between 9:00 am and 4:00 am is 5 hours.
So the total time taken=12+5=17 hours
We know that, average speed = total distance travelled/total time taken
                                            =1384/17=81 km/h
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