Car

The driver of a car is to get to 608 km distant city. From atlas found that 162 km will have to pass through the cities at average speed 48 km/h. Remainder of the journey pass outside the cities at average speed 116 km/h. Calculate how many hours it will take journey.

Result

t =  7.22 h

Solution:

t=t1+t2 t1=s1/v1=162/48=3.38 h t2=(ss1)/v2=(608162)/116=3.84 h t=3.38+3.84=7.22 ht = t_1 + t_2 \ \\ t_1 = s_1 / v_1 = 162 / 48 = 3.38 \ h \ \\ t_2 = (s-s_1)/ v_2= (608- 162) / 116 = 3.84 \ h \ \\ t = 3.38 + 3.84 = 7.22 \ \text{h}



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