Question
A boat goes 5 km an hour in still water, but takes twice
as much time in going the same distance against the current. The speed of the current (in km/hour) is :Solution
Let the speed of the current be x kmph. According to the question, 5/(5 – x) = 2 ⇒ 10 – 2x = 5 ⇒ 2x = 10 – 5 ⇒ x = 5/2 = 2.5 km/hr
3. 8, 15, 24, 34, 48, 63
Select the wrong term in the series.
44, 47, 41, 50, 38, 53, 40
Select the wrong term in the series.
10, 19, 23, 52, 61, 133, 149
Find the wrong number in the following number series:
2500, 1000, 400, 160, 60
A series is given with one wrong term. Select the wrong number from the given series.
17, 29, 43, 59, 77, 97, 112
8, 20, 48, 108, 232, 482
In this question, one term in the number series is wrong. Find out the wrong term.
130, 135, 143, 154, 168, 183, 205
Find the wrong number.
17, 25, 37, 47, 65, 81
Arrange the following words in a logical and meaningful order.
1. Monkey
2. Elephant
3. Rat
4. Fly
5. Lion
Select the number from among the given options that is wrong in the following series.
22, 30, 46, 78, 146, 270
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