Question
The ratio of the speed of boats ‘A’ and ‘B’ in
still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 8 hours to travel 640 km downstream, then find the time taken by boat ‘B’ to travel 168 km upstream and 880 km downstream. (Note: Both the boats are rowing in the same stream.)Solution
Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 640/8 Or, 10x = 80 Or, x = 8 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 56 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 88 km/hr Required time taken = (168/56) + (880/88) = 3 + 10 = 13 hours
Choose the figure which is different from the rest.
Select the one which is different from the other three responses.
Choose the figure which is different from the rest.
In each problem, out of the four figures marked (1) (2) (3) and (4), three are similar in a certain manner. However, one figure is not like the other t...
In each problem, out of the four figures marked (1) (2) (3) and (4), three are similar in a certain manner. However, one figure is not like the other t...
In each of the following questions select the one which is different from the other three responses.
How many 5's are there followed by 3 but not preceded by 7?
7 5 3 1 6 8 5 8 4 3 5 3 7 1 6 1 5 8 6 4 5 3 2 5
...In each problem, out of the four figures marked (1) (2) (3) and (4), three are similar in a certain manner. However, one figure is not like the other t...
(A) Calm: Windy
(B) Happy: Sane
(C) Extravagant: Thrifty
(D) Limited: Boundless
From among the given alternatives select the one in which the set of numbers is most like the set of numbers given in the question.
(5, 9, 17)
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