Let the total distance between A and B be\(d\) , and\(s\) be thespeed.
\(\frac{d}{2*90} + \frac{d}{2*s} = \frac{d}{60}\)
\(\frac{d}{180} + \frac{d}{2s} = \frac{d}{60}\)
\(\frac{d}{2}(\frac{1}{90} + \frac{1}{s}) = \frac{d}{2}(\frac{1}{30})\)
\(\frac{1}{s} = \frac{1}{30} - \frac{1}{90} = \frac{60}{2700} = \frac{2}{90}\)
\(s = \frac{90}{2} = 45.\) Ans - B.
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\(\frac{d}{2*90} + \frac{d}{2*s} = \frac{d}{60}\)
\(\frac{d}{180} + \frac{d}{2s} = \frac{d}{60}\)
\(\frac{d}{2}(\frac{1}{90} + \frac{1}{s}) = \frac{d}{2}(\frac{1}{30})\)
\(\frac{1}{s} = \frac{1}{30} - \frac{1}{90} = \frac{60}{2700} = \frac{2}{90}\)
\(s = \frac{90}{2} = 45.\) Ans - B.
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