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.A truck moves at a constant speed of 90km / h for a straight highway. 1. )How far does it travel in 2 hours? 2. )How far does it travel per
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Answers ( )
1) In 1 hour it travels 90km then in 2 hours it’s 180km traveled.
2) it travels 90km in 1 hour
There are 3600 seconds (60×60)
In an hour.
Therefore 90km/3600seconds= 0.025km or 25 metres
3) 10km/90km = 0.11~
0.11 x 60 minutes = 6.67 minutes ~
Answer:
1) 180 km
2) 25 m
3) 6 min 40 sec
Explanation:
1) Distance = rate × time
d = (90 km/hr) × (2 hr)
d = 180 km
2) Convert km/hr to m/s.
1 km = 1000 m, and 1 hr = 3600 s.
90 km/hr × (1000 m / 1 km) × (1 hr / 3600 s) = 25 m/s
So the truck moves 25 meters per second.
3) Distance = rate × time
10 km = (90 km/hr) × t
t = 1/9 hr
t = 6 min 40 sec