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Question

An accurate clock shows 10 o’clock in the morning. Through how many degrees the hour hand would have rotated, when the clock shows 3 o’clock in the afternoon?

एक सटीक घड़ी प्रातःकाल 10 बजे का समय दिखाती है। दोपहर 3 बजे तक घंटे की सुई कितने डिग्री घूमेगी?

A
120 degrees

120 डिग्री
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B
150 degrees

150 डिग्री
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C
160 degrees

160 डिग्री
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D
180 degrees

180 डिग्री
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Solution

The correct option is B 150 degrees

150 डिग्री
In one hour the hour hand will rotate 1 unit (say 10 to 11)
That means rotation of 36012=30 degrees in one hour.
Therefore, degrees by which it will rotate in 5 hours (i.e. from 10 AM to 3 PM) = 30 × 5 = 150 degrees.

एक घंटे में घंटे की सुई 1 इकाई घूमेगी (अर्थात 10 से 11)
इसका अर्थ है कि 36012 का घूर्णन = एक घंटे में 30 डिग्री।
इसलिए, 5 घंटे में तय डिग्री (अर्थात सुबह 10 बजे से दोपहर 3 बजे तक) = 30 × 5 = 150 डिग्री।

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