WAEC - Mathematics (2005 - No. 31)
A train moving at a uniform speed covers 36km in 21 minutes. How long does it take to cover 60km?
35 mins
40 mins
45 mins
90 mins
설명
Since 36km in 21 minutes
1km in \(\frac{21}{36}\)minutes
60km in \(\left(\frac{21}{36}\times 60\right)\)minutes = \(\frac{70}{2}\)min
= 35 mins
1km in \(\frac{21}{36}\)minutes
60km in \(\left(\frac{21}{36}\times 60\right)\)minutes = \(\frac{70}{2}\)min
= 35 mins