Question
The ratio of the speed of boat ‘A’ in still water,
the speed of boat ‘B’ in still water and the speed of the current is 7:5:2, respectively. If the time taken by boat ‘A’ to travel (6D – 30) km downstream is equal to the time taken by boat ‘B’ to travel (D + 60) km upstream, then find the value of ‘D’.Solution
Let, the speeds of boat ‘A’ and boat ‘B’, in still water and the speed of the current be 7x km/hr, 5x km/hr and 2x km/hr, respectively. According to the question, (6D – 30)/(7x + 2x) = (D + 60)/(5x – 2x) Or, 18D – 90 = 9D + 540 Or, 9D = 630 Or, D = 70
Choose the missing term.
R, U, X, A, D,?
168, 164, 155, 139, ?, 78
What will come in place of the question mark (?) in the following series?
4, 8, 2, 12, 1.5, ?
14 20 28 39 ? 74
Find the missing number in the given number series.
130, 152.5, 177, 203.5, 232, ?Â
What will come in place of the question mark (?) in the following series?
10, 410, ?, 710, 760, 785
2807, 1400, 697, 346, 171, 84, 41, ?
What will come in place of (?) question mark in the given number series.
5, 15, 35, 75, 155, ?
415 246 367 ? 335 310
...2.5Â Â Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.875Â Â Â Â Â 3.75Â Â Â Â Â Â Â ?
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