At what time between 7 and 8 o'clock will the | vedclass

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(B) To find the time when the hands of a clock are at a right angle between $H$ and $H+1$ o'clock,we use the formula: $	ext{Minutes} = (5H \pm 15)

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$21 \frac{9}{11}$ minutes past $7$

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(B) To find the time when the hands of a clock are at a right angle between $H$ and $H+1$ o'clock,we use the formula: $	ext{Minutes} = (5H \pm 15) 	imes \frac{12}{11}$.Here,$H = 7$.Case $1$: $(5 	imes 7 - 15) 	imes \frac{12}{11} = (35 - 15) 	imes \frac{12}{11} = 20 	imes \frac{12}{11} = \frac{240}{11} = 21 \frac{9}{11}$ minutes past $7$.Case $2$: $(5 	imes 7 + 15) 	imes \frac{12}{11} = (35 + 15) 	imes \frac{12}{11} = 50 	imes \frac{12}{11} = \frac{600}{11} = 54 \frac{6}{11}$ minutes past $7$.Thus,the hands are at a right angle at $21 \frac{9}{11}$ minutes past $7$ and $54 \frac{6}{11}$ minutes past $7$ o'clock.

At what time between $7$ and $8$ o'clock will the hands of a clock be at a right angle?

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