Multiple choice

Ram travels 60km at the speed 30km/h and next 30km at 15 km/h and 180km at the speed of 90km/h. find his average speed?

  1. 35 km/h

  2. 45 km/h

  3. 55 km/h

  4. 90 km/h

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average speed = total distance / total time. Total distance = 60 + 30 + 180 = 270 km. Time for each segment: 60/30 = 2 hr, 30/15 = 2 hr, 180/90 = 2 hr. Total time = 6 hr. Average speed = 270/6 = 45 km/h. The key is that you cannot simply average the speeds (30, 15, 90) because distances are different.

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