Shyam can complete a task in 12 days by working 10 hours a day. How many hours a day should he work to complete the task in 8 days?

14 16 12 15

15

Formula to be used here, \( { M}_{1 } \) x \( {H}_{1 } \)  = \( { M}_{2 } \) x \( {H}_{2 } \)  where, M = No. of Men, H = No. of hours, ⇒ Putting the values in the formula, ⇒ 12 x 10 = 8 x \( {H}_{2 } \)  ⇒ \( {H}_{2 } \) = 15 hrs.