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2.5 min

3 min

3.2 min

3.5 min

B. 3 min

$Totaldis\mathrm{tan}cecovered=\left(\frac{7}{2}+\frac{1}{4}\right)miles\phantom{\rule{0ex}{0ex}}=\frac{15}{4}miles.\phantom{\rule{0ex}{0ex}}ThereforeTimetaken=\left(\frac{15}{4x75}\right)hrs\phantom{\rule{0ex}{0ex}}=\frac{1}{20}hrs\phantom{\rule{0ex}{0ex}}=\left(\frac{1}{20}x60\right)min.=3min.$