GATE Papers >> EEE >> 2019 >> Question No 4

Question No. 4 EEE | GATE 2019

It takes two hours for a person X to mow the lawn. Y can mow the same lawn in four hours. How long (in minutes) will it take X and Y, if they work together to mow the lawn?


Answer : (B) 80


Solution of Question No 4 of GATE 2019 EEE Paper

X can mow the lawn → 2 hour ⇒ X's 1 hour work $ =\frac12 $

Y can mow the lawn → 4 hour ⇒ Y's 1 hour work $ =\frac14 $

(X + Y)'s → 1 hour work $ =\left(\frac12+\frac14\right)=\frac{2+1}4=\frac34 $ 

Total time required $ =\frac1{\left({\displaystyle\frac34}\right)}=\frac43\mathrm{hours}=\frac43\times60\min=80\min $

Comments
GNnIiW http://pills2sale.com/ levitra nizagara

Posted on  18/10/2020 18:14:20  by  dobsonz
Leave a comment
Go