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Question Number 102857 by mathocean1 last updated on 11/Jul/20

Commented by PRITHWISH SEN 2 last updated on 11/Jul/20

$$\frac{11}{2}\{2\mathrm{a}+(11-1)4\}=374$$$$\mathrm{a}=14$$$$\therefore \mathrm{It}\mathrm{takes}14\mathrm{mins}.\mathrm{to}\mathrm{sweep}\mathrm{the}\mathrm{first}\mathrm{class}$$

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