a can fill it working alone in 20 hours
thus, in one hour, part of tank filled by a= 1/20
b can fill it working alone in 30 hours
thus, in one hour, part of tank filled by b= 1/30
c can fill it working alone in 60 hours
thus, in one hour, part of tank filled by c= 1/60
thus, part of tank filled by a and c in 1hr =(1/20)+ (1/60)=4/60=1/15
thus, part of tank filled by b and c in 1hr =(1/30)+ (1/60)=3/60=1/20
thus part of tank filled in 2 hrs=(1/15)+(1/20)=7/60
thus time required to completely fill tank=(60/7) hours
hope it helps
11 am to 12 noon is the hour of every sitting
An hour is the first hour of every sitting.
Generally, the first hour of a sitting of Lok Sabha is devoted to Questions and that hour is called the Question Hour. It has a special significance in the proceedings of Parliament. Asking of questions is an inherent and unfettered parliamentary right of members.
mark me as brainlest answer
plz mark me brianleast
frequency divided by the speed of light is ν/c, from the above equation is 1/λ. when wavelength is measured in metres, 1/λ represents the number of waves of the wave train to be found in a length of one metre or, if measured in centimetres, the number in one centimetre.
answer:sorry i don't know the answer i with you nexttime