Question
Armaan and Bhanu working together can finish a certain
task in 90 days, and Bhanu collaborating with Chintu can complete the same task in 70 days. If Armaan's efficiency is 40% less than Chintu, determine the time Armaan alone needs to complete 80% of the work.Solution
ATQ, Let the total work be 630 units. (LCM of 90 and 70) Amount of work done by Armaan and Bhanu together in one day = 630/90 = 7 units Amount of work done by Bhanu and Chintu together in one day = 630/70 = 9 units Difference between the efficiencies of Armaan and Chintu = 9 – 7 = 2 units Amount of work done by Chintu alone in one day = 2/0.40 = 5 units Amount of work done by Armaan alone in one day = 0.6 × 5 = 3 units Time taken by Armaan alone to complete 80% work = 0.8 × 630/3 = 168 days
Which of the following statement(s) is/are true?
I. During inhalation ribs move out
II. During exhalation ribs move in
What is the name of the reaction in which acid reacts with base to form salt and water?
The membrane surrounding the cell is called
Which polymer is used in the production of bullet-proof materials?
Which part of the flower is responsible for producing pollen?
When heated with chloroform, secondary amines and tertiary amines
A conducting sphere of radius R carries a charge Q. If half of the charge is transferred to an identical uncharged sphere brought into contact and remov...
Which colour is the complementary colour of yellow?
A battery of emf 12 V and internal resistance 4 ohm is connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the re...
The electrical conductivity of a semiconductor increases with rise in temperature because:
Relevant for Exams:
