17. A 33 rpm lp record which normally plays for 30 minutes wasinadvertently star

Question

17. A 33 rpm lp record which normally plays for 30 minutes wasinadvertently started at 45 rpm, then switched to 33 rpm when themistake was realized. Altogether the record played for 26 minutes.For how many minutes was it playing at 45 rpm? a. 8 b. 10 c. 12 d. 14 e. None of the above 17. A 33 rpm lp record which normally plays for 30 minutes wasinadvertently started at 45 rpm, then switched to 33 rpm when themistake was realized. Altogether the record played for 26 minutes.For how many minutes was it playing at 45 rpm? a. 8 b. 10 c. 12 d. 14 e. None of the above

Explanation / Answer

33*30=45x+33*(26-x) --> 33.4 =12x --> x=11 Answer: e

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