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makkiz [27]
3 years ago
13

The time required to deliver and install a computer at a customer's location is t= 4 + d over r, where t is time in hours, d is

the distance, in miles, from the warehouse to the customer's location, and r is the average speed of the delivery truck. If it takes 6.2 hours for the employee to deliver and install a computer for a customer located 100 miles from the warehouse, what is the average speed of the delivery truck?
Mathematics
1 answer:
Sladkaya [172]3 years ago
7 0
t=4+\frac{d}{r} \\ \\
t=6.2 \ [h] \\
d=100 \ [miles] \\ \\
6.2=4+\frac{100}{r} \\
6.2-4=\frac{100}{r} \\
2.2=\frac{100}{r} \\
2.2r=100 \\
r=\frac{100}{2.2} \\ r=45 \frac{5}{11} \\
r \approx 45.45 \ [\frac{miles}{h}]

The average speed of the delivery truck is about 45.45 miles per hour.
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