SOLUTION: a car travels 120km in 1 hour 40 mins. work out the speed of the car in km/h

Algebra ->  Length-and-distance -> SOLUTION: a car travels 120km in 1 hour 40 mins. work out the speed of the car in km/h       Log On


   

Question 157899: a car travels 120km in 1 hour 40 mins. work out the speed of the car in km/h
Found 2 solutions by oscargut, jojo14344:
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
a car travels 120km in 1 hour 40 mins.
120 km in 100 mins
x km in 60 mins
x=120(60)/100=12(6)=72
Answer: speed is 72 km/h

Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
a car travels 120km in 1 hour 40 mins
.
Remember: Speed=Distance%2FTime
where Time= 1 hour & %2840cross%28mins%29%29%281hr%2F60cross%28mins%29%29=1.666667hrs
So, S=120km%2F%281.6666667hr%29
S=72km%2Fhr
OR, Time=1hour & 40 mins = 60 mins+40mins=100mins
So,S=120km%2F100mins=%281.2km%2Fcross%28min%29%29%2860cross%28mins%29%2F1hr%29=72km%2Fhr
thank you,
Jojo