It takes 1 hr 20 mins to bake a 3 kg cake. How long will it take to bake 4 such cakes?	
(a)	3 hrs	
(b)	4 hrs	
(c)	3 hrs 40 mins	
(d)	5 hrs 20 mins
WHAT IS THE SOLUTION
It takes 1 hr 20 mins to bake a 3 kg cake. How long will it take to bake 4 such cakes?	
(a)	3 hrs	
(b)	4 hrs	
(c)	3 hrs 40 mins	
(d)	5 hrs 20 mins