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Petrus takes a bus to school. The bus travels at an average speed of 40 km/ h. The school is 9 km from his house. How many minutes does he take to get to school?

Sagot :

[tex]distance\ = \ 9 \ km\\ speed = 40 \ \frac{ km}{h}\\time =? \\\\speed = \frac{distance }{time} \\\\speed \cdot time= distance \\ \\ time =\frac{distance }{speed} \\\\time = \frac{9 \ km }{40 \ \frac{km}{h}}= \frac{9}{40}\ h =\frac{9}{40}*60 \ min =\frac{9}{2}*3 \ min =\frac{27}{2}\ min =13.5 \ min [/tex]