1.

A coil heat certain amount of water in 20 min. Another coil heat the same water for temperature rise in 60 min. If the two coils are connected in parallel, find time taken to heat same water for same temperature rise(1) 10 min.(2) 15 min.(3) 80 min.(4) 60 min.

Answer»

Correct option is (2) 15 min

t = \(\frac{t_1t_2}{t_1+t_2}\) = \(\frac{20\times60}{80}\) = \(\frac{120}{8}\) 

 = 15 min



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