Maths / Ratio and Proportion / Statement Sums involving Ratios

QUESTION
 

A car can travel 21 km in 28 minutes. The distance it will travel in  large 2frac {1}{2}  hours is

OPTIONS
A. 

72 km

B. 

100 km

C. 

112.5 km

D. 

63.5 km

Right Option : C

EXPLANATION
Explain TypeExplanation Content
Text

28 minutes  small =frac {7}{15}hour

small because  In 28 minutes car travels = 21 km

small because   In  small frac {7}{15}  hour car travelled = 21 km

In 1 hour car travelled  small =left ( frac {21}{frac {7}{15}} right )km

small =frac {21 times 15}{7}=45km

small therefore  In  small 2frac {1}{2}=frac {5}{2}  hours distance travelled by car

small =left ( 45 times frac {5}{2} right )km=112.5km

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