Jain drives from city A to B at average speed of 90 kilometre per hour as soon as I reach heater around and come back to city but this time at an average speed of 30 kilometre per hour what is the average speed in the kilometre per have for the whole journey?
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let sat distance = 90D km
speed from A to B = 90 km/hr
Time from A to b =90D/90 = D hr
speed from B to A = 30 km/Hr
time from B to A = 90D/30 = 3D hr
total distance = 90D + 90D = 180D km
total time taken = D + 3D = 4D hr
average speed = 180D/4D = 45 km/Hr
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