Question
A was travelling from point X to point Y. He increased
his speed by 8 km/h after every hour. He reached his destination in 12 hours. If his initial speed was 20 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (12/2) × {2 × 20 + (12 – 1) × 8} = 5 × (40 + 88) = 768 km Required average speed = 768/12 = 64 km/h
More Time and distance Questions
- 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
Relevant for Exams:
