book Maths Puzzle Numerical Ability

what is the distance between the points (-2sq. root 7, 10) and (4sq. root 7 , 8)?

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book Other Question

A person starts in a car to attend a marriage and travels with constant speed. After 2 hrs one of the tires got punctured and it took 10min to replace. Later he travels at 30miles/ if a boat goes downstream at 72 miles in three hours, and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are_____________?