if teena is driving at 55 miles per hour and is currently 7.5 miles behind joe , who is driving at 40 miles per hour in the same direction then in how many minutes will teena be 52.5 miles ahead of joe ?
"this type of questions should be solved without any complex calculations as these questions become imperative in gaining that extra 30 - 40 seconds for a difficult one . teena covers 55 miles in 60 mins . joe covers 40 miles in 60 mins so teena gains 15 miles every 60 mins teena need to cover 7.5 + 52.5 miles . teena can cover 7.5 miles in 30 mins teena will cover 52.5 miles in 210 mins so answer 30 + 210 = 240 mins . ( answer b )"
multiply(divide(add(subtract(55, 40), 7.5), subtract(55, 40)), const_60)