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%
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
CB_W V_SP _NLI HG_B A_XU
Six boxes, M, N, O, P, Q and R. are kept one above the other but not necessarily in the same order. There is only one box between box N and box R. Box Q...
Select the figure that will come next in the following figure series.
Select the figure which satisfies the same conditions of placement of the dots as in Figure-X.
What will come in place of '?' in the following equation, if '+' and '–' are interchanged and '×' and '÷' are interchanged.
125 − 75 + 15...
Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as me...
Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.
In a row of Cars, Maruti is 8th from the left and Toyota is 17th from the right. If they interchange their positions, Maruti becomes 14th from left. Ho...
There are five boxes K, L, M, N and O, arranged one above the other. Box M is placed above box N. Box O is placed below box K. Box N is placed above K. ...
Two statements are given, followed by four conclusions numbered I, II, III and IV.
Assuming the statements to be true, even if they seem to be...
