Indian Institute of Foreign Trade 2017 Solved Paper

Question : 71 of 114

Marks: +1, -0

Ramesh and Sohan start walking away from each other from a point P at an angle of 120°. Ramesh walks at a speed of 3 km/hour while Sohan walks at a speed of 4 km/hour. What is the distance between them after 90 minutes?

9.89 km
10.56 km
9.12 km
12.42 km

Validate

Solution:

Choice (C) Distance traveled by Ramesh and Sohan in 90 minutes are 4.5 km and 6 km. Since they are moving at an angle of 120° , hence distance between them is

√ { 4.5 ^ { 2 } + 6 ^ { 2 } - 2 × 4.5 × 6 × \cos 120 } = √ { 83.25 } = 9.12

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