Tech Mahindra Placement: Sample Questions 16 - 17 of 42

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Question 16

Question

MCQ▾

If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream?

Choices

Choice (4)

a.

34 km/hr

b.

13 km/hr

c.

26 km/hr

d.

None of the above

b.

Explanation

• Boat is moving in upstream with velocity of 14 km/hr, i.e.. b = 14 km/hr
• Boat is moving in downstream with velocity of 40 km/hr, i.e.. a = 40 km/hr
• Here, we have to find the speed of stream.
• Let the speed of stream be v km/hr.
• Speed of stream,

• Speed of stream is 13 km/hr.

Question 17

Edit

Write in Short

What will be the next term of the series?

23, 48,84, 133, — -

Explanation

• First term of the series is 23 and second term of the series is 48.
• Difference between first and second term is 25, which is square of 5.
• Third term of the series is 84.
• Difference between second and third term of the series is 36, which is square of 6.
• Fourth term of the series is 133.
• Difference between third and fourth term of the series is 49, which is square of 7.
• Following the same pattern, difference between fourth and fifth term of the series should be square of 8, i.e.. 64
• Therefore,
• Fifth term of the given series should be 197.

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