exam Maths Puzzle Numerical Ability

solve.
two planes travel toward each other from cities that are 780km apart at rates of 190 km/h and 200km/h. They started at the same. In how many hours will they meet?

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exam Other Question

how do i work the answer out to this question :[ ] - -3 = -6 I need some help to simplify this radical
^3(sqrt) 48
**the ^ is an index number, if that made sense****

a. 16
b. 4 ^3(sqrt)4
c. 2 ^3/9sqrt)6
d. 8 ^3(sqrt)6

Thanks so much for the help in advance!