3.4X10^-5 in standard form

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Iknow the answer but the calculator doesn't seem to give the right one

The length of the shadow of a building is 120 meters, as shown below: building shadow 120 m what is the height of the building? (1 point)