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what time between 4 and 5 o'clock will the hands of a clock be at rightangle?

A. 3.454545454545455

B. 4.454545454545454

C. 5.454545454545454

D. 6.454545454545454

View Answer

Correct choice: C

Explanation:

this type of problems the formulae is (5*x + or -15)*(12/11) Here x is replaced by the first interval of given time here i.e 4 Case 1 : (5*x + 15)*(12/11) (5*4 +15)*(12/11) (20+15)*(12/11) 35*12/11=420/11=38 2/11 min. Therefore they are right angles at 38 2/11 min .past4 Case 2 : (5*x-15)*(12/11) (5*4-15)*(12/11) (20-15)*(12/11) 5*12/11=60/11 min=5 5/11min Therefore they are right angles at 5 5/11 min.past4.

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