Speed Average = 2*a*b / (a+b) ; when distance is constant for both the speeds "a" & "b"
A person reaches his office from home at 10:00 AM with constant speed of 20Km/Hr, with speed of 40 Km/Hr he reaches at 8:00 AM,. What should be his speed if he wants to reach his office at 9:00 Am
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