Average speed for 3 equal distances at 20,30,60 km/h? MCQ with Answer and Explanation

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Average speed for 3 equal distances at 20,30,60 km/h?

A. 40

B. 30 km/h

C. 36.67

D. 33.33

Answer: Option B

Solution (By JKExamLibrary)

3d / (d/20 +d/30 +d/60) =3 / (0.05+0.0333+0.0167) =3/0.1 =30.

This question belongs to: Maths Average

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Question #1 Report Error

If the average of a,b,c,d is 30 and average of a,b is 25, average of c,d is

A. 32

B. 30

C. 35

D. 28

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Correct Answer: Option C

Explanation:
a+b+c+d =120. a+b=50. c+d=70. Average c,d =35.

This question belongs to: Maths Average

Question #2 Report Error

The average marks of 20 students is 75. If a student with 90 marks leaves, what is the new average?

A. 73.5

B. 74.0

C. 75.0

D. 74.21

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Correct Answer: Option D

Explanation:
Sum=20×75=1500. New sum=1500-90=1410. New average=1410/19=74.21.

This question belongs to: Maths Average

Question #3 Report Error

The average of 150,200,250 is

A. 200

B. 195

C. 210

D. 190

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Correct Answer: Option A

Explanation:
600/3=200.

This question belongs to: Maths Average

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