A. 10 kmph

B. 21 kmph

D. 12 kmph

B. 21 kmph

**C. 8 kmph****(Correct)**D. 12 kmph

Explanation:

S = 4

M = x

DS = x + 4

US = x – 4

6/(x + 4) + 6/(x – 4) = 2x = 8

Answering Exams

A. 10 kmph

B. 21 kmph

**C. 8 kmph**** (Correct)**

D. 12 kmph

** (Correct)**

B. 21 kmph

D. 12 kmph

Explanation:

S = 4

M = x

DS = x + 4

US = x – 4

6/(x + 4) + 6/(x – 4) = 2x = 8

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