Question
A boat can travel 21 km downstream in 42 min. The ratio
of the speed of the boat in still water to the speed of the stream is 5: 1. How much time will the boat take to cover 25 km upstream?Solution
Speed of downstream = D/T = 21 × (60/42) = 30 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 1 (5x, x) => 6x = 30 => x = 5 Speed of upstream = 5x – x = 4x = 20 km/hr Distance = 25 km Time = D/S = 25/20 = 1(1/4) hrÂ
What value should come in the place of (?) in the following number series?
500, 789, 428, ?, 340, 965
Choose the missing term.
R, U, X, A, D,?
204, ?, 120, 83, 52, 23
6, 7, 16, 51, 208, ?
226, 171, 124, 85, 54, ?
4, 5, 11, 34, 137, ?
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
8, ?, 29, 57, 113, 225
In each of the following series, one term is missing. Find the missing term.
7, 11, 19, 35, 67, ?
What should come in place of (?) question mark in the following number series.
5, 11, 23, 47, 95, ?
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