Question
A person travels from city A to city B at 60 km/h and
returns at 40 km/h. If the total time taken for the round trip is 6 hours, find the distance between the two cities.Solution
Let the distance between the two cities be D km. Time taken to travel from A to B = D / 60 Time taken to travel from B to A = D / 40 Total time = D/60 + D/40 = 6 hours Finding a common denominator: (2D + 3D) / 120 = 6 5D = 720 D = 720 / 5 = 144 km Correct answer: c
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
