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?
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
If × stands for 'addition', ÷ stands for 'subtraction', + stands for 'multiplication' and - stands for 'division', then 31 × 18 ÷ 20 - 5 + ...
Which two signs should be interchanged to make the following equation correct?
48 – 114 ÷ 3 + 6 × 7 = 44
If ‘P’ means (÷), ‘Q’ means (×), ‘R’ means (+), and ‘S’ means (-), then what is the value of the expression: 840 P 14 R 32 Q 8 S 99 R...
Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
168 * 8 * 7 * 34 * 94 = 256
Which two signs need to be interchanged to make the following equation correct?
75 – 18 × 80 ÷ 16 + 40 = 125
Which signs should be interchanged to make the given equation correct.
51 ÷ 3 + 17 x 14 - 2 = 6
Which sequence of mathematical symbols among given sequences must be inserted in place of the (?) in order to obtain the desired result?
(250 ? 7...
Which two signs should be interchanged to make the following equation correct?
7 × 6 ÷ 3 – 6 = 40 + 20
After interchanging "×" and "÷", "7" and "4", which of the following equations becomes correct?
If “ A ” denotes “added to”, “ B ” denotes “divided by”, “ C ” denotes “multiplied by” and “ D ” denotes “subtracted from...
