Question
Rohan can finish a task alone in 24 days. Shreya can do
50% of the same task alone in 12 days. If Shreya and Tanya work together, they can complete 60% of the task in 9 days. Find the time taken by Rohan and Tanya to finish the task together.Solution
ATQ, Time taken by Shreya to do the entire task = 12 ÷ 0.5 = 24 days Time taken by Shreya and Tanya to do the entire task together = 9 ÷ 0.6 = 15 days Let the total work be 120 units {LCM (24, 24, and 15)} So, the combined efficiency of Shreya and Tanya = 120 ÷ 15 = 8 units/day Efficiency of Shreya = 120 ÷ 24 = 5 units/day Efficiency of Tanya = 8 - 5 = 3 units/day Efficiency of Rohan = 120 ÷ 24 = 5 units/day So, required time taken = 120 ÷ (5 + 3) = 120 ÷ 8 = 15 days
Which of the following statements are true?
Six friends A, L, K, D, B and G are sitting on a bench facing towards north. 'A' is sitting second to the left of 'G' And 'G' is sitting fourth to the r...
Seven persons, R, S, T, U, V, W and X, sit along a linear row. All face in the south direction. T sits along the middle of the row. W sits second to the...
Railway station is in which direction with respect to the auto stand?
A, B, C, D, and E are sitting in a line. C is sitting at the west end and E is the neighbor of B and C. Between A and C there are two persons. Who is si...
Which of the following statements is not true?
Five friends R, S, T, U and V are sitting in a straight line all facing in the north direction. R is sitting at one of the extreme ends. Three people ar...
Statements:
P ≤ J ≤ Q = M; Y ≥ Z > P
Conclusions:
I. J ≤ Z
II. Z ˃ Y
If all the persons are made to sit in alphabetical order with respect to G in clockwise direction, then how many persons remain unchanged in their posit...
Which of the following is R’s position?
Relevant for Exams:
