Comprehension Passage
Directions: Study the following information carefully and answer the questions.
The line graph shows the average speed, distance traveled, and travel time for the school buses travelling between the school and the destination point.

Note:
(i) The Below table shows the destination point of four school buses
(ii) Total travel time = total stoppage time + bus running time
(iii) Average speed = total distance traveled/total travel time
(iv) Number of stops = Total stoppage time/duration of stoppage time in each stop
(v) Number of stops for the bus A, B, C and D are (y - 2), y, (y + 2) and (y + 3) respectively.
(vi) If the value of ‘(x/5) - (y/2) is 5 and the sum of the average speed of four buses together is 245.
If bus D runs nonstop between school and city S, then it reaches city S, 39 minutes earlier; then find the speed of bus D?
1
90 kmph
2
75 kmph
3
80 kmph
4
85 kmph
5
95 kmph