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 7 hours to travel 490 km downstream, then find the time taken by boat ‘B’ to travel 98 km upstream and 770 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 = 490/7 Or, 10x = 70 Or, x = 7 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 49 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 77 km/hr Required time taken = (98/49) + (770/77) = 2 + 10 = 12 hours
Select the option that is related to third number-cluster in the same way first number cluster is related to second number-cluster.
94: 97 ...In the following question, select the related word from the given alternatives.
GSJM : PMVJ : : USBN : ?
Select the option that is related to third word in the same way as the second word is related to first word.
SETS : WAXO :: PORT : ?
6 : 120 : : 24 : ?
Select a suitable figure from the Answer Figures that would replace the question mark (?) from question figure.
Five marbles named as A1, K1, P1, R1, and T1 are kept one above the other (not necessarily in the same order). Only marble T1 is between K1 and P1. P1 i...
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Select the option that is related to the third number in the same way as the second number is related to the first number.
55 : 3136 :: 48 : ?Select the option that is related to third number cluster in the same way second number cluster is related to first number cluster.
14: 168 :: 21: ?
Select the option that is related to third cluster in the same way first cluster is related to second cluster.
TURN : 219 :: MAINS: ?
