On Jessica's first day of work, she drove 17.3 km/hr for 251.5 km. If Jessica increases her speed to 27.3 km/hr on her second day, how much time (in hours) would she
save?

if you answer my question i will answer yours

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

you get 2.3=1.21*\frac{a}2 or 4.6=1.21a or a=3.802 (b)

explanation: