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Boats & Streams, Pipes & Cisterns · Question 11 of 85

A boat moves at 10 km/h in still water in a stream of 2 km/h; another boat goes 14 km/h downstream and 6…

Question 11

MediumOriginal question

A boat moves at 10 km/h in still water in a stream of 2 km/h; another boat goes 14 km/h downstream and 6 km/h upstream. Match each quantity in List I with its value in List II.

List IList II
A. First boat, downstreamI. 10 km/h
B. First boat, upstreamII. 12 km/h
C. Second boat, in still waterIII. 4 km/h
D. Second boat's streamIV. 8 km/h
Options for question 11

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. First boat: 10+2=1210 + 2 = 12 and 10−2=810 - 2 = 8.

  2. Second boat: 14+62=10\frac{14 + 6}{2} = 10 in still water, 14−62=4\frac{14 - 6}{2} = 4 for the stream.

Concept
The four speeds
Typical time
120 s
Your time
—
The rule this testsUpstream and downstream speeds
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