Question
Nikita covered a total distance of 400 km — partly by
airplane at 200 km/h and partly by bus at 80 km/h. If she took 3.5 hours to reach, how many kilometers did she travel by airplane?Solution
ATQ,
Let airplane distance = d km
Then, by bus = 400 - d km
Time equation: d / 200 + (400 - d) / 80 = 3.5
LCM of 200 and 80 = 400
Or, (2d + 5(400 - d)) / 400 = 3.5
(2d + 2000 - 5d) / 400 = 3.5
(2000 - 3d) / 400 = 3.5
Multiply both sides:
2000 - 3d = 1400
3d = 600
d = 200
Distance by airplane = 200 km
(1/2) – (3/5) + 3(1/3) = ? + (5/6)
9 × 40 × 242 × 182 = ?2
212.3 × 4414.7 × 4623.4 × 4845.85 = 462?
52% of 400 + √(?) = 60% of 600 - 25% of 400
447.8 × 441.2 ÷ 445 = 44 × 44?
Determine the value of 'p' in following expression:
720 ÷ 9 + 640 ÷ 16 - p = √121 X 5 + 6²- 7What will come in the place of question mark (?) in the given expression?
(? ÷ 16) = (20 ÷ ?) X 20- What will come in the place of question mark (?) in the given expression?
62.5% of 120 + ? = (720 + 90) ÷ √36 - What will come in place of the question mark (?) in the following questions?
25% of 360+40=? 30% of 2200 +’?’ x 50 – 1020 = 11x 306 + (√ 2250 ÷ 0.1)