Q. 95.0( 3 Votes )

# What is the angle

Answer :

Hour’s hand rotates 360° in = 12 hour = 720 min

Minute’s hand rotates 360° in = 1 hour = 60 min

i) At, 1.40hrs

Time past after 0.00 hrs = 1 hr + 40 min = 100 min

In 100 min hour’s hand rotate =

In 100 minminute’s hand rotate =

∴ Difference between the hands,

= 240° - 50°

= 190°

ii) At 2.15 hrs,

Time past after 0.00 hrs = 2 hr + 15 min = 135 min

In 135 min hour’s hand rotate =

In 135 min minute’s hand rotate =

∴ Difference between the hands,

= 90° - 67.5°

= 22.5°

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