1.

1). \(63\frac{1}{3}\) hours2). 75 hours3). 60 hours4). 56 hours

Answer»

Rahim does (7/10) part of a work in = 21 HOURS

∴ Rahim completes the work in = 21 × (10/7) hours = 30 hours

∴ Part of work Rahim can do in an hour = 1/30

Remaining part of the work = 1 – (7/10) = 3/10

Bablu and Rahim together DONE 3/10th part of the work in 6 hours

∴ Bablu and Rahim can COMPLETE the work = 6 × (10/3) hours = 20 hours

∴ Part of work Bablu and Rahim can do in an hour = 1/20

∴ Part of work Bablu alone can do in an hour

= Part of work Bablu and Rahim can do in an hour – Part of work Rahim can do in an hour

= (1/20) – (1/30)

= 1/60

∴ Bablu alone can complete the work in 60 hours



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