One of the two buses completes a journey of 300 miles in 7 1/2 hours and the other journey of 450 miles in 10 hours. the ratio of their average speed is

A. 2:3


B. 4:5


C. 3:4


D. 8:9


E. 5:6

• 300 miles completed in 7 1/2 hours means 27000 sec
  450 miles completed in 10 hours means 36000 sec
  speed=distance/time
  1st bus speed:2nd bus speed=300/27000:450/36000=10/9:5/4=40:45=8:9
• 10 years agoHelpfull: Yes(3) No(0)
• total distance =240 miles
  total time in hour= 11.40-4.28=4hrs 48 mins =4.8 hrs
  50 miles/hr
• 10 years agoHelpfull: Yes(0) No(4)