Question
The downstream speed of a boat is 8 km/hr more than its
upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 11:4. Find the total time taken by boat to travel 60 km downstream and 42 km upstream?Solution
Let the speed of boat in still water be x km/hr and that of stream be y km/hr. ATQ, ⇒ (x + y) – (x – y) = 8 ⇒ y = 4 km/hr ⇒ x = 4 × 11/4 = 11 km/hr Required time = [60/(11+4)] + [42/(11−4)] = 10 hr
8, 20, 48, 108, 232, 482
In the following question, select the wrong number from the given alternatives.
52, 26, 26, 52, 208, 1644
Select the wrong term in the series.
5, 32, 157, 490, 1831, 4028
In the following question, select the wrong number from the given alternatives.
43, 50, 64, 85, 113, 138
Find the wrong number in the series given below.
6, 19, 59, 182, 544, 1637
Identify the letter-cluster that does not belong to the following series.
RBK, TYM, VVO, XSP, ZPS, BMU
Find the wrong number in the series given below.
5, 16, 50, 157, 463, 1394
Arrange the following words in a logical and meaningful order.
1. Monkey
2. Elephant
3. Rat
4. Fly
5. Lion
Select the wrong term from the given series?
RFD, OBY, LXT, ITO, FSK
Find the wrong term in the series given below.
38, 44, 32, 50, 24, 56, 20Â
