Q: A boat covers a distance of 12 km. The distance of first 4 km in the downstream is covered in 15 minutes. The next 8 km is travelled in upstream. The speed of the boat in the downstream is twice the speed of the boat in the upstream. Find the average speed of journey.
A.
11.6 km./hr.
B.
9.6 km./hr.
C.
10 km./hr.
D.
10.4 km./hr.
Correct Answer:
Option B -
Explanations:
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