If A works twice as fast as B, and A can complete a task in 10 days, how many days will it take for B to complete the task?
Show answer & explanation
Correct answer: D
Explanation
A's speed = 2 times B's speed
A completes the work = 10 days
If A : B = 2 : 1 (Speed)
Then the ratio of time = 1 : 2
A's time = 10 days
B's time = 10 × 2 = 20 days