About 120, if I recall correctly, though it could be less.
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35 MPH equals 51.33 feet per second. So it would take 0.974 seconds to go exactly 50 feet at exactly 35 MPH. In reality, you need to be concerned with the accuracy of your original measurements, and not perform calculations to a level of precision that isn't appropriate to the precision of your measurements. Your car's speedometer probably isn't accurate to a half mile per hour, so when your speedometer says "35", you're probably going somewhere between 33 and 37 MPH. Saying that it would take "about one second" is going to be close enough to the right answer.
(30 mph) x (1/2 h) = 15 miles
420 inches.
40
The length of the other leg is 60.62 feet.