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a bus travels 36 km in 40 min.if it maintains a uniform speed, how long will it take to cover 216 km ?

Answer :

Mathexpert
36 km  ------>  40 min
216 km ------>  ? min

[tex] \frac{216}{36}*40 [/tex] = 240 minutes = 4 hours.
so using unitary method 

36 km is covered in 40 min
so 1 km is covered in 40/36 min
and therefore 
216 km is covered in 40 x 216/36 min = 240 min = 4 hr

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