A man travels three-fifths of distance AB at a speed of 3a, and the re – McqOptions

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1.	A man travels three-fifths of distance AB at a speed of 3a, and the remaining at a speed of 2b. If he goes from B to A and back at a speed of 5c in the same time, then:
A.	1/a + 1/b = 1/c
B.	a + b = c
C.	1/a + 1/b = 2/c
D.	None of these
Answer» B. a + b = c

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