Question
A race track is in the shape of a rectangle with length
of 28 metres and area of 5600 m2. A car takes 20 seconds to make one lap around the perimeter of this track. If the car and a person whose speed is 4 m/s, started moving at the same time along the perimeter of the track but in opposite directions, then find the distance between the car and the person, 3 seconds before they cross each other.Solution
Area of the track = length of track x breadth of track = 28 x breadth of track = 5600 So, breadth of track = 5600 ÷ 28 = 200 So, perimeter of the track = (28 + 200) x 2 = 456 metres So, speed of the car = (456/20) = 22.8 m/s Relative speed of the car with respect to the person = 22.8 + 4 = 26.8 m/s So, distance between the car and the person, 3 seconds before they cross each other = 26.8 x 3 = 80.4 metres
254, ?, 1022, 1150, 1214, 1246
What will come in place of (?) Question mark in the given number series.
10, 15, 30, 75, 225, 787.5, ?
69, 35.5, 39.5, 68.25, 152.5, ?
166    156    136   ?     66    16
114, 146, 210, 306, 434, ?
- What will come in place of the question mark (?) in the following series?
1.36, 2.72, 5.44, 10.88, 21.76, ? The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the questions...
51    52    48     57    ?      66      30
...3   2   3   6   14    ?    115.5
What will come in place of the question mark (?) in the following series?
?, 65, 37, 73, 29, 81
