Question
'A' and 'B' alone can complete a work in 14 days and 21
days, respectively. Find the time taken by them to complete the work if they work on alternate days starting with 'B'.Solution
ATQ, Let the total work be the LCM of 14 and 21, which is 42 units. Efficiency of 'A' = 42/14 =3 units/day Efficiency of 'B' = 42/21=2 units/day If the work was started by 'B', then on the first day, work completed by 'B' = 2 units On the next day, work completed by 'A' = 3 units Therefore, in two days, the amount of work completed by 'A' and 'B' = 2 + 3 = 5 units So, in 14 days, work completed by 'A' and 'B' = 5 × 7 = 35 units Remaining work = 42 - 35 = 7 units The remaining work will be completed by 'B' in 7/2=3.5 days Therefore, total time taken by them to complete the work = 14 + 3.5 = 17.5 days
First Train started in India?
DFCCIL received US$ ______ billion for the construction of the Eastern Corridor in 2014.
The idea of a railway to connect Bombay with Thane, Kalyan and with the Thal and Bhore Ghats was first approached by _________________________
A horse-drawn tramway began operation in Bombay between Colaba and Parel in the year:
Indian manufacturing output grew by 5.6% a year between _____ and _____ .
Which Indian railway station has become the 1600th station to have a RailWire Wi-Fi zone?
The feeder route from ________ to Palanpur is part of the doubling works of the existing railway line.
Railways have launched the main arch of the world's highest bridge on the River Chenab in Jammu and Kashmir's Reasi district. The bridge is ___________...
In the Railway Budget of 2016, three dedicated freight corridors were announced. Which of the following is one of them?
Which is the Fastest train in India?
Relevant for Exams:
