At what time. between 5 and 6 o’clock. will the two hands of a clock be at nght angle?

A

$$40\frac{5}{11}$$ past 5

B

$$42\frac{6}{11}$$ past 5

C

$$43\frac{7}{11}$$ past 5

D

$$39\frac{4}{11}$$ past 5