isi-entrance 2018 Q27

isi-entrance · India · UGA Straight Lines & Coordinate Geometry Perspective, Projection, and Applied Geometry
Between 12 noon and 1 PM, there are two instants when the hour hand and the minute hand of a clock are at right angles. The difference in minutes between these two instants is:
(A) $32 \frac { 8 } { 11 }$
(B) $30 \frac { 8 } { 11 }$
(C) $32 \frac { 5 } { 11 }$
(D) $30 \frac { 5 } { 11 }$. 
Between 12 noon and 1 PM, there are two instants when the hour hand and the minute hand of a clock are at right angles. The difference in minutes between these two instants is:\\
(A) $32 \frac { 8 } { 11 }$\\
(B) $30 \frac { 8 } { 11 }$\\
(C) $32 \frac { 5 } { 11 }$\\
(D) $30 \frac { 5 } { 11 }$.
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