Selected MCQ

Current Question
If X runs 48 m and Y runs 42 m in a race of 1 km, how much does Y beat X by?
  • A. 140 m
  • B. 125 m
  • C. 100 m
  • D. 110 m
Correct Answer: B
Explanation:
Using the ratio method gives 125 m.
Related Question 1
In a 1000 m race, A beats B by 100 m. In an 800 m race, B beats C by 100 m. By how much does A beat C?
  • A. 57.5 m
  • B. 127.5 m
  • C. 150.7 m
  • D. 98.6 m
Correct Answer: B
Explanation:
Using the proportional race method gives 127.5 m.
Related Question 2
In a 100 m race, A beats B by 25 m and B beats C by 4 m. By how much does A beat C?
  • A. 21 m
  • B. 26 m
  • C. 28 m
  • D. 29 m
Correct Answer: C
Explanation:
Using the proportional speed relation gives 28 m.
Related Question 3
In a kilometer race, A beats B by 50 m or 10 seconds. What is A’s time?
  • A. 200 sec
  • B. 190 sec
  • C. 210 sec
  • D. 150 sec
Correct Answer: B
Explanation:
The ratio method gives A’s time as 190 sec.
Related Question 4
In a 300 m race, A beats B by 22.5 m or 6 seconds. What is B’s time?
  • A. 86 sec
  • B. 80 sec
  • C. 76 sec
  • D. None of these
Correct Answer: B
Explanation:
The ratio method gives B’s time as 80 sec.
Related Question 5
A lotion contains 50% alcohol. How much water must be added to reduce the alcohol content to 25% in 9 ml?
  • A. 3 ml
  • B. 4 ml
  • C. 5 ml
  • D. 6 ml
Correct Answer: D
Explanation:
Using the dilution Equation yields 6 mL of water.