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Speed of the boat in still water = 56/4 = 14 km/h Let the speed of the stream = x km/h So according to question: 42/(14 – x) + 72/(14 + x) = 8 294 + 21x + 504 –36x = 784 – 4x2 4x2 – 15x + 14 = 0 4x2 – 8x – 7x + 14 = 0 4x(x – 2) – 7(x – 2) = 0 (4x – 7)(x – 2) = 0 x = 2, 7/4 = 2, 1.75 As the speed of the stream is greater than 1.75, the value of x = 2 So the downstream speed and upstream speed of the boat are 16 km/h and 12 km/h respectively. So the desired percentage = (16 – 12)/16 × 100 = 25%
Which number will replace the question mark (?) in the following series?
5, 13, 22, 40, 83, 175, 348,?
Statements:
All buses are cars.
No jeep is a car.
Conclusions:
I. No car is a jeep.
II. No jeep is a bus.
Prakash is standing facing the West. He takes a left turn after walking 2 m. Then he walks 3 m, takes a left turn and walks 3 m. He takes a last left tu...
In the following question below are given some statements followed by some conclusions based on those statements. Taking the given statements to be tru...
Study the given pattern carefully and select the letter that can replace the question mark (?) in it.
Which of the following numbers will replace the question mark (?) in the given series?
15, 27, 12, ?, 9, 33
In a certain code language, ‘STORY’ is coded as ‘97’ and ‘PULL’ is coded as ‘61’. How will ‘INCOME’ be coded in that language?
...In the following question, select the related letters from the given alternatives.
KLMN : GIKM : : PQRS : ?
Six colleagues, Ranjana, Diksha, Chahat, Aakash, Rita and Suraj, are sitting on a bench in a pack facing north. Rita is sitting at the east end of the b...
statement:
Residents of this region are frequently faced with incidents of sudden power surges and voltage surges which cause damage to sensitive...
