Question
A, B and C start running at the same time and at the
same point in the same direction in a circular stadium. A completes a round in 720 seconds, B in 1080 seconds and C in 1800 seconds. After what time will they meet again at the starting point?Solution
Factors of 720 = 2 × 2 × 2 × 2 × 3 × 3 × 5 Factors of 1080 = 2 × 2 × 2 × 3 × 3 × 3 × 5 Factors of 1800 = 2 × 2 × 2 × 3 × 3 × 5 × 5 LCM = 23 x 33 × 5 = 1080 seconds Thus, required time = 1080 seconds = 18 minutes
More HCF and LCM Questions
√? = 32% of 900 + 48% of 50
Simplify-
x + 3(y + x – 2) – (x + y).
567-4824 ÷ 134 =? × 9
Find the value of the expression:
18 + 12 – 4 × [22 + 6 – 2 × (38 – 23)]- What will come in place of (?), in the given expression.
75% of 640 – 20% of 150 = ? 60 % of 640 - 57 × 2 - 1520 / 38 = ?
36 × 15 + 20% 1250 = ? + 296
Find the value of 16 x [(8 - 5) of 12 ÷ 4].
1885 ÷ 64.98 + 7.29 + ? = 69.09
