p is going to Delhi from Gurgaon by his car at a speed of 40 km/h. while coming back, he returns with a speed of x km/h. what should be the value of x so thqy his average speed during the entire journey is 80 km/h?
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Answer:
In this problem, average speed = 2x/{x/60 + x/40} = 2x/ {(2x + 3x)/120} = 120.2x/ 5x = 48 Km/hr. Answer: Kindly go through the attached file. i.e. 48km/hr is the average speed.
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Distance between Gurgaon and Delhi = S km
Time taken to go from Delhi to Gurgaon = S / 60 hours
Time taken to return = S / 40 hours
Total time = S [ 1/40 + 1/60 ] = S/24 hours
Average speed for the entire journey = total distance / total time duration
= 2 S / ( S/24) = 48 kmph
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