Two trains start from same place at same time at right angles to each other. The

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Question
Two trains start from same place at same time at right angles to each other. Their speeds are 36km/hr and 48km/hr respectively. After 30 seconds the distance between them will be ?
Options
A. 900 mts
B. 300 mts
C. 250 mts
D. 500 mts

Correct Answer

500 mts

Explanation

Using pythagarous theorem,
distance travelled by first train = 36x5/18x30 = 300m
distance travelled by second train = 48x5/18x30 = 400m
so distance between them =?( 90000 + 160000) = ?250000 = 500mts.

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More questions

1. If a= x13y13+x-13y-13 then a3-3ay-x is equal to
Options
A. y^2x
B. x^2y
C. a^2x
D. a^2y

Discuss

Correct Answer: y^2x

2. 1.52 x 0.0225 = ?
Options
A. 0.0375
B. 0.3375
C. 3.275
D. 32.75

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Correct Answer: 0.3375

3. If x(2x + 3) = 90 and 7y-1/2+ 2y-1/2= y1/2 (x and y are positive numbers), then what is the value of x2+ y2 ?
Options
A. 45
B. 109
C. 117
D. 126

Discuss

Correct Answer: 117

4. If a3+ b3 = 341 and ab = 30, then what is the value of a + b?
Options
A. 1
B. 9
C. 7
D. 11

Discuss

Correct Answer: 11

5. Common factor of 24b6c8d2, 18a6c2d4, 12a4b4 is
Options
A. 72a2b2c2d2
B. 72a6b6c8d4
C. 6a2b2
D. 6

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Correct Answer: 72a6b6c8d4

6. The value of 80-11245-63 is:
Options
A. 3/4
B. 4/3
C. 4/7
D. 7/4

Discuss

Correct Answer: 4/3

Explanation:

$\frac{\sqrt{80} - \sqrt{112}}{\sqrt{45} - \sqrt{63}} = \frac{\sqrt{16 � 5} - \sqrt{16 � 7}}{\sqrt{9 � 5} - \sqrt{9 � 7}} = \frac{4 \sqrt{5} - 4 \sqrt{7}}{3 \sqrt{5} - 3 \sqrt{7}}$

$= \frac{4 (\sqrt{5} - \sqrt{7})}{3 (\sqrt{5} - \sqrt{7})} = \frac{4}{3}$

7. Point P (-2, 5) is the midpoint of segment AB. Co-ordinates of A are (-5, y) and B are (x, 3). What is the value of x?
Options
A. 1
B. -1
C. 2
D. -2

Discuss

Correct Answer: 1

8. Calculate the value of 61681x61681-31681x3168130000
Options
A. 93352
B. 94362
C. 93362
D. 95362

Discuss

Correct Answer: 93362

9. If x = 2 + 223 + 213 then find the value of x3-6x2+6x ?
Options
A. 1
B. 2
C. 3
D. 4

Discuss

Correct Answer: 2

Explanation:

Given that $x = 2 + 2^{\frac{2}{3}} + 2^{\frac{1}{3}}$

So x - 2 = $2^{\frac{2}{3}} + 2^{\frac{1}{3}}$

Now cubing on both sides, we get

=> $x^{3} - 8 - 6 x^{2} + 12 x = 4 + 2 + 6 (x - 2)$

Therefore, $x^{3} - 6 x^{2} + 6 x = - 6 + 8 = 2$

10. If x = 11, the value of x5 - 12x4 + 12x3 - 12x2 + 12x - 1 is
Options
A. 11
B. 10
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Discuss

Correct Answer: 10

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Two trains start from same place at same time at right angles to each other. Their speeds are 36km/hr and 48km/hr respectively. After 30 seconds the distance between them will be ?

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