Problem: johnny travels a total of one hour to and from school . on the way there he jogs at 6 miles per hour and on the return trip he gets picked up by the bus and returns home at 20 miles per hour . how far is it to the school ?
Rationale: "answer : d ) 9.2 miles . average speed for round trip = 2 * a * b / ( a + b ) , where a , b are speeds so , average speed was = 2 * 6 * 20 / ( 6 + 20 ) = 9.2 m / hr the distance between schoolhome should be half of that . ie . 9.2 miles answer d"
annotated_formula: multiply(divide(const_1, add(divide(const_1, 6), divide(const_1, 20))), const_1_6)