I drove 60 km at 30 kmph and then an additional 60 km at 50 kmph. Compute my average speed over my 120 km.

(a) 40
(b) 37 1/2
(c) 25 1/2
(d) 50

• I drove 60 km at 30 kmph in 2 hrs and then an additional 60 km at 50 kmph. in 60/50 or 6/5 hrs.
  
  Average speed = 120/(2+6/5) = 120*5/16 = 75/2 kmph = 37 1/2 kmph .. option (b)
• 13 years agoHelpfull: Yes(3) No(1)
• b 37(1/2)
  120/((60/30)+(60/50))
  75/2 or 37 1/2
• 6 years agoHelpfull: Yes(0) No(0)
• Time taken to travel first 60 km = distance/speed = 60/30 = 2 hr
  Time taken to travel next 60 km = 60/50 = 1.2 hr
   Average speed = Total distance travelled/ Total time taken to travel that distance = 120/3.2= 37.5 kmp
• 5 years agoHelpfull: Yes(0) No(0)
• To find the average speed, we need to divide the total distance traveled by the total time taken. The total distance is 120 km and can be divided into two parts: 60 km and 60 km. The time taken to travel the first 60 km at a speed of 30 kmph is 2 hours (60 divided by 30), and the time taken to travel the second 60 km at a speed of 50 kmph is 1.2 hours (60 divided by 50).
  
  The total time taken to travel 120 km is 2 + 1.2 = 3.2 hours. To find the average speed, we divide the total distance by the total time: 120 divided by 3.2. The average speed is approximately 37.5 kmph.
• 5 Months agoHelpfull: Yes(0) No(0)