Problem Solving (PS) | At what time between 4 and 5 o’clock in a 12-hour clock, the min hand

At what time between 4 and 5 o’clock in a 12-hour clock, the min hand and hour hand of the clock will be at right angle for the second time?


A. 4:38
B. 4:38 2/11
C. 4:37
D. 4:37 2/11
E. 4:39

let m=location of minute hand
m-(20+m/12)=15→
m=38 2/11 minutes
4:38 2/11
B

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