Selected MCQ

Current Question
A runs 1⅔ times as fast as B. If A gives B a start of 80 m, how far should the finishing post be?
  • A. 200 m
  • B. 300 m
  • C. 270 m
  • D. 160 m
Correct Answer: A
Explanation:
Use the relative speed ratio.
Related Question 1
One pipe fills a tank three times as fast as another. Together they fill in 36 minutes. The time taken by the slower pipe is ____.
  • A. 81 min
  • B. 108 min
  • C. 144 min
  • D. 192 min
Correct Answer: C
Explanation:
Let slow rate = x → total = 4x → gives 144 min.
Related Question 2
A can do work 3 times faster than B. If together they finish in 32 hours, how long does A take alone?
  • A. 32 hours
  • B. 48 hours
  • C. 3 days
  • D. 4 days
Correct Answer: A
Explanation:
Work ratio simplifies to A alone time.
Related Question 3
The tens digit of a two-digit number is 2 more than the units digit. The number is 7 times the sum of its digits. Find the units digit.
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Correct Answer: B
Explanation:
Let the unit digit = x, solve Equation.
Related Question 4
A sum becomes triple in 3 years at compound interest. In how many years will it become 9 times?
  • A. 18
  • B. 12
  • C. 9
  • D. 6
Correct Answer: D
Explanation:
Growth is exponential → 6 years.
Related Question 5
If one number is 3 times another and their sum is 80, the numbers are ____.
  • A. 20 and 60
  • B. 25 and 55
  • C. 30 and 50
  • D. 15 and 65
Correct Answer: A
Explanation:
Let x + 3x = 80 → x = 20.