A bus goes to Ranchi from Patna at the rate of 80 km per hour. Another bus leaves Ranchi for Patna at the same time as the first bus at the rate of 90 km per hour. Find the average speed for the journeys of the two buses combined if it is known that the distance from Ranchi to Patna is 720 kilometres.
(a) 84.705 kmph
(b) 84 kmph
(c) 81.63 kmph
(d) 82.82 kmph
Answers
Answered by
5
Answer:
84.705 kmph
Step-by-step explanation:
Time taken by first bus=720/80= 9 hours
Time taken by second bus= 720/90 =8 hours
Total distance = 720+720 = 1440km
total time taken = 8+9 = 17 hours
Average speed= 1440/17= 84.705 kmph
Answered by
1
Answer:
A)
Step-by-step explanation:
not sure but try.........
Similar questions