What is the area  of the triangle ABC with vertices A (1, 2, 3), B (2, -1, 4) and C (4, 5, -1)?
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Problems from 08/15/13

PROBLEM #1
An flight left 30 minutes later than its scheduled time and in order to reach
the destination 1500 miles away in time, it has to increase its speed by
250 miles/hr from the usual speed. What is its usual speed?

SOLUTION 1
750 mph. 

PROBLEM #2
The students of a class are made to stand in rows. If three more students are added to each row, there would be two rows less. If there was one less student in each row, would be one row more. What is the number of students in the class?

SOLUTION 2
72. 

Congratulations to Kishore Balsara and Lalit Doshi, who were the winners of the last set of puzzles.