Rahim does \(\frac{7}{{10}}\) of a work in 21 hours. He then calls in Bablu and they together finish the remaining work in 6 hours. How long Bablu alone would take to do the whole work?
1
\(63\frac{1}{3}\) hours
2
75 hours
3
60 hours
4
56 hours
Rahim does \(\frac{7}{{10}}\) of a work in 21 hours. He then calls in Bablu and they together finish the remaining work in 6 hours. How long Bablu alone would take to do the whole work?