a car travels 40km in 30 min and the next 40km in 40 min find average speed for entire journey
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distance in first phase = 40km
time taken = 30/60 hrs =1/2 hrs
distance covered in second phase = 40 km
time taken = 40/60 hrs = 2/3 hrs
average speed = 40+40/1/2+2/3
= 80÷7/6
= 80 × 6/7
= 480/ 7
= 68.5 kmph
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