Let total amount work be = 44 x 20 = 880 units Amount of work done by Q and R in 30 days = 30 x 13 = 390 units Amount of work left = 880 – 390 = 490 Required time = 490/7 = 70 days
Which lens is used in sodium reflector lamp ?
What characteristic makes metals good conductors of electricity?
Which of the following wind is also known as “ICE HEATER?”
Where should an object be placed in front of a concave mirror such that the image of the object is of the same size as the object?
What term describes the rate of change of velocity?
Why does a solid chunk of iron float in mercury but sink in water?
Which of the following is the best fire-extinguisher?
If an object is pulled by holding it from both ends, then the force applied on it is called _______.
Which Vitamin is soluble in water?
The Atom Bomb dropped in Nagasaki is an uncontrolled nuclear fission made up of:
