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Flame SCF 18 Near Chawla Lights Ph-7 Mohali 9888949978

39. A person went from P to Q, at an average speed of a km/hr, from Q to R at an average speed of b km/hr, and from R to S at an average speed of the c km/hr. If PQ = QR = RS, then the average speed of the person for traveling from P to S was

(a) (a + b + c)/ 3

(b) 3abc/(ab + bc + ca)

(c) 3abc/(a + b + c)

(d) 3(ab + bc + ca)/(a + b + c)

Answer: b

5/5 - (2 votes)

PrevPrevious39. Ashok covered a distance of 225 km as follows. He covered the first 15 km at 45 km/hr, the next 120 km at 60 km/hr and the remaining journey at 90 km/hr. Find his average speed for the journey of 225 km

Next41. The distance between two points P and Q is 115 km. Two persons start at the same time but one travelling from P towards Q and the other travelling from Q towards P. If their respective speeds are 40 kmph and 52 kmph, where do they meet each other?Next

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