What is the class of the 4th Submarine INS Vela ?
INS Vela (S24) is the fourth submarine of the first batch of six Kalvari-class submarines for the Indian Navy. It is a diesel-electric attack submarine based on the Scorpene class, designed by French naval defence and energy group DCNS and manufactured by Mazagon Dock Limited.
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A alone can complete 50% of a work in 9 days while B takes 6 days more than A to complete it. If B and C together can complete the work in 12 days, then...
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A is thrice as efficient as B and can finish a piece of work in 20 days less than B. B can finish this work in how many days?
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