The persons start walking at a steady pace of 3 km/hour from a road 1 intersection along two roads that make an angle of 60 with each other. What will be the (shortest) distance separating them at the end of 20 minutes ?

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Q: 140 (IAS/1994)
The persons start walking at a steady pace of 3 km/hour from a road 1 intersection along two roads that make an angle of 60° with each other. What will be the (shortest) distance separating them at the end of 20 minutes ?
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question_subject: 

Maths

question_exam: 

IAS

stats: 

0,10,12,3,3,6,10

keywords: 

{'distance': [0, 3, 3, 3], 'intersection': [0, 1, 0, 1], 'km': [0, 0, 2, 1], 'angle': [0, 0, 1, 0], 'steady pace': [0, 1, 0, 0], 'minutes': [0, 0, 1, 1], 'road': [1, 2, 5, 6], 'roads': [0, 1, 0, 2], 'hour': [5, 5, 11, 12]}