Question
Train A, moving at a speed of 90 km/h, passes a
stationary pole in 9.4 seconds. When encountering Train B, which is traveling towards it at a speed of 54 km/h, Train A takes 12.5 seconds to completely pass Train B. Calculate the length of Train B.Solution
Speed of train A = 90 × 5/18 = 25 m/s Length of train A = 25 × 9.4 = 235 metres Let length of train B = ‘l’ metres Speed of train B = 54 × 5/18 = 15 m/s Relative speed if train A with respect to train B = 15 + 25 = 40 m/s So, I + 235 = 40 × 12.5 = 500 So, l = 265 metres
If ‘A’ means (÷), ‘B’ means (×), ‘C’ means (+), and ‘D’ means (-), then ____ is the value of the expression.
25 A 5 B 8 D 6 C 4...
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
56 * 492 * 6 * 7 * 123 = 507
Select the correct combination of mathematical signs that can sequentially replace ‘*’ sign and balance the equation given below.
54 * 2 * 4 ...
- Which two signs should be interchanged to correct the given equation?
5 + 3 × 8 – 12 ÷ 4 = 3 If 'A' stands for '-', 'B' stands for '×', 'C' stands for '+', and 'D' stands for '÷', then what is the value of the following expression.
54 D...
What will be the value of expression if the signs ‘(-)’ and ‘(+)’ are interchanged?
75 + 42 – 6 × 56 ÷ 7 + 6 × 3 – 2
...If 'A % B' means 'A + B', 'A # B' means 'A X B', 'A @ B' means 'A - B' and 'A $ B' means 'A ÷ B', then what is the value of the expression ‘13 # 19 %...
What will be the value of the given expression after the following interchanges?
Expression: 84 ÷ 11 - 15 X 14 + 75
Interchanges: Sign: '...
If ‘ × ’ means ‘ + ’. ‘+’ means ‘÷’, ‘-’ means ‘×’ and ‘÷’ means ‘-’, then 9 × 8 – 5 + 40 ÷ 3 = (?)
...Which two signs need to be interchanged to make the following equation correct?
62 – 14 × 75 ÷ 15 + 50 = 82
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