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Question
A person travels form P to Q at a speed of 40 kmph and returns by increasing his speed by 50%. What is the average speed for both the trips?
36 kmph
45 kmph
48 kmph
50 kmph
ANSWER : 4
Descrption
<p>let, P to Q is x km. Thus he travels 2x km</p> <p>1st Speed = 40kmph and 2nd speed will be = 40 + 40X50% = 60kmph</p> <p>Now, time to go P to Q = x/40 and time to come from Q to P is = x/60 and total time taken = x/40 + x/60 = 5x/120 = x/24</p> <p>Thus, Average speed = 2x/(x/24) = (24X2x)/x = 48kmph</p> <p>Ans: Average Speed 48km/h</p>
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