Question
A boat goes 9 km an hour in still water, but takes twice
as much time in going the same distance against the current. The speed of the current (in km/hour) is :Solution
Let the speed of the current be x kmph. According to the question, 9/(9 – x) = 2 ⇒ 18 – 2x = 9 ⇒ 2x = 18 – 9 ⇒ x = 9/2 = 4.5 km/hr
Time taken by A and B together to complete a work is 1 day less than the time taken by B alone to complete the same work. With his half efficiency B can...
Arjun, Bharat and Chintu together can complete a task in 8 days. Bharat is 25% less efficient than Arjun. Arjun and Chintu together can complete the tas...
Elvish is 10% more efficient than Fatima. Elvish completes typing 198 pages in 18 hours. Find how many pages Fatima can type in 5 hours.
25 men can complete a piece of work in 13 days. One man starts the work and after every day one more man joins the work and this continues till the work...
M and N, working in tandem, can successfully attain the sales target within a span of 15 days. Now, if N's efficiency is _______ percent less than that ...
‘M’ is 60% more efficient than ‘N’. ‘N’ started the work alone and worked for 16 days and after that ‘N’ is replaced by ‘M’. If the ...
- 'Karan', 'Ravi', and 'Deepak' together can complete a work in 24 days. 'Karan' and 'Ravi' together can complete the same work in 96 days. 'Deepak' alone ca...
Working individually, 'A' can finish 60% of a task in 18 days, and 'B' takes 15 days longer than 'A' to complete the entire task. However, 'B' and 'C' w...
- 'Meera', 'Kiran', and 'Suman' together can complete a work in 30 days. 'Meera' and 'Kiran' together can complete the same work in 90 days. 'Suman' alone ca...
10 men or 50 women can complete a piece of work in 40 days. A man and a woman together complete the work and receive a total wage of Rs. 6,000. Find the...
