TCS Company Numerical Ability Time and Work

during rain rock is driving in a truck which passes a man on foot that is trading at a rate of 2 km/hr in the same direction the man could see the truck for 6 minutes and it was visible upto a distance of 0.6 km.what is the speed of truck

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TCS Other Question

A can do a piece of work in 20days,which B can do in 12 days,in 9 days B does 3/4th of the work.how many days will A take to finish remaining work?? their are 1000 ice cream vending machines in school.the 1ts student goes to all ice cream vendings.The2nd studentcisits every alternate vending machine.the student visits evert 3rd vending then what is number of vending machines will most student visit?