It was the semester exam day, Vidhya caught the college bus. She enjoyed traveling by bus. Moving at 6 mph, the bus took Vidhya to college at the right time. She finished her exam and had a chit chat with her friends and suddenly she realized that it was 6 pm and she had missed the college bus. She decided to walk back home at 4 mph. What is her average speed for the day?
(a) 4 mph
(b) 5 mph
(c) 2.4 mph
(d) 4.8 mph

• Use formula for average speed: 2xy/(x+y). Putting x=6 and y=4, we get average speed=4.8 mph.
• 12 years agoHelpfull: Yes(14) No(2)
• (2*6*4)/10=4.8mph
• 12 years agoHelpfull: Yes(4) No(3)
• coming(bus speed=6mph
  return speed=4mph
  average speed=(2*6*4/6+4)=48/10
  =4.8mph
  or
  she walks only 4mph.the bus speed cant be added
  so average is 4mph
  
• 12 years agoHelpfull: Yes(3) No(5)
• The formula in this case: 2xy/x+y
  so 2*6*4/10=48/10
  = 4.8 mph is the answer :-)
• 12 years agoHelpfull: Yes(3) No(0)