Question

A person goes to office either by car, jeep, bus or train. The probabilities of which being 2/7, 3/7, 1/7 ,1/7 respectively. The probability that he reaches office later if he takes jeep, bus, car or train is 2/9, 1/9, 5/9, 2/9 respectively. If he reaches office in time, then the probability that he travelled by car is

Answer 1

i think the answer is 3/64