1
Q:
A) 10 minutes | B) 15 minutes |
C) 12 minutes | D) 20 minutes |
Answer: B) 15 minutes
Explanation:
Explanation:
Working efficiency of both typist together = 100/6 = 16.66%
Let the efficiency of first typist be x and second typist be (16.66 –x)
First typist for 4 minute + second tyoistfor 6 minute = 80% work
⇒4x + (16.66 –x) X 6 = 80%
⇒4x + 100% -6x = 80%,
⇒x = 10%
First typist typed 10% per minute, second typst typed (16.66 –10) = 6.66% per minute
Slowest is second typist complete whole job in 100/6.66 = 15.01 = 15 minute