A car travels at a speed of 50km/hr for 30 min. at 30km/hr for next 15min and then
70km/hr for next 45min what is the avg. speed of the car.
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Answer:
36 km is the average speed
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30min = 1/2 hr , 15 min = 1/4hr , 45 min = 3/4 hr
total time = 1/2 + 1/4+3/4 = 1/2 +1 = 3/2 hr
avr speed of car = total speed /time =
= 50+30+70/ 3/2 = 150 / 3/2 = 100km/hr
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