Question
 A starts from point P towards Q at a speed of 4 km/h.
After 30 minutes, B starts from P towards Q at a speed of 6 km/h. At what distance from P will B catch A?Solution
Let B take t hours after starting to catch A. Time of A = t + 1/2 hour Distance covered is same for both when B catches A: 4(t + 1/2) = 6t 4t + 2 = 6t 2 = 2t t = 1 hour Distance from P = speed of B × time of B = 6 × 1 = 6 km
What will come in place of the question mark (?) in the following series?
45, 66, 44, 67, 43, ?
53 × 38 + 32 × âˆ›54872 = ?
5, 23, 18, 36, 31, ?
In each of the following number series, one term is missing. Find the missing term.
2, 6, 12, 20, 30, ?, 56
What will come in place of the question mark (?) in the following series?
16, 16, ?, 96, 384, 1920
7    8     ?     13     17     22    28
...40   41    37   46    ?      55    19
...In each of the following number series, one term is missing. Find the missing term.
121, 100, 81, ?, 49, 36
14 6 4 4 ? 48
...15, 120, 840, 5040, ?, 100800
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