A man travels first half distance at 20 km/h, second at 30 km/h. Average speed? MCQ with Answer and Explanation

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A man travels first half distance at 20 km/h, second at 30 km/h. Average speed?

A. 25 km/h

B. 22 km/h

C. 26 km/h

D. 24 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

2*20*30/(20+30)=1200/50=24 km/h.

This question belongs to: Maths Average

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Question #1

Average of 15 numbers 28. If one number 40 is replaced by 25, new average?

A. 27.5

B. 28

C. 27

D. 26.67

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Correct Answer: Option C

Explanation:
Change -15, decrease 1. New=27.

This question belongs to: Maths Average

Question #2

Average of 15 numbers 1010. If average of 9 is 1005, average of remaining 6?

A. 1017.5

B. 1020

C. 1015

D. 1018

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Correct Answer: Option A

Explanation:
Sum15=15150. Sum9=9045. Remaining=6105. Average=1017.5.

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Question #3

Find the average of all numbers from 1 to 20 that are divisible by 4.

A. 11

B. 12.5

C. 13

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Correct Answer: Option D

Explanation:
Numbers: 4,8,12,16,20 sum=60, count=5, avg=12.

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