Explanation
In 12 hours, they are at right angles 22 times.∴In 24 hours, they are at right angles 44 times.
Option D is correct.
A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:
Work efficiency of 34 men in 8 days working 9 hours a day is 25th
Hence, work efficiency of x men to finish rest of the work in 6 days working 9 hours a day = 1−25=35
∴ By direct proportionality,
34×8×925=x×6×935
∴34×72×35=x×54×25
∴x=34×72×3×554×2×5
∴x=68
Hence extra men required = 68−34=34men
So, the answer is option C
(A+B+C)'s one days's work=110
So (A+B+C)'s 4 day's work=410=25
Remaining part of the work=1−25=35
∵35part of the work done by (B+C)= 10 days
∴ 1 work done by (B+C)=1035=503Days
∴A alone work=110−350=125
Hence A alone complete the work in 25 days.
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