Need math help with probability

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What is the probability of arriving at a traffic light when it is red if the red signal is flashed for 30 sec, the yellow signal for 5 sec, and the green signal for 40 sec?
A.
B.
C.
D.
Nov 22nd, 2015

hello


propability of red light = 30 / ( 30+5+40)

                                  = 35 / 75

                                   = 0.4 


ANSWER IS option B

B . The probability is 0.40


hope you understood..please message if you have any doubts...thank you
Nov 22nd, 2015

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