Question
A person travels from point A to point B at a speed of
60 km/h and returns to point A at a speed of 80 km/h. He spends 2 hours less on the return journey than on the onward journey. Find the distance between A and B.Solution
Let the distance between A and B be D km. Time taken to travel from A to B = D/60 hours Time taken to return from B to A = D/80 hours According to the given condition, D/80 = D/60 - 2 Multiply both sides by 120 to simplify: 3D = 4D - 480 D = 480 km Answer: b) 480 km
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What approximate value should come in the place of (?) in the following questions?
908.90 –190.32 + √? = 23.03 * 5.2 + 24.72
? = (7.11/2.12) + (10.88/4.09) + (45.12/11.98)
? = {29.7% of (97.72 × 40.04)} ÷ 3.92
(44.79 × 74.21) ÷ (11.862 – 33.12) + 37.48% of ? = 180.23
111.89 × 4.12 – 504.04 ÷ 2.12 = 170.12 + ?
√49 + 6.66% of 1725 + 22² = ?² - √361
[(√2024.85 ÷ 3.01) + (35.76 ÷ 11.92)]² × (3/4 of 39.99) = ?
(88.931% of 435) + (61.521% of 516) = ?
14.232 + 19.98% of 629.99 = ? × 6.99
