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प्रश्न
Choose the most appropriate option:
A train which is moving at an average speed of 40 kmph, reaches its destination on time. When its average speed reduces to 35 kmph, then it reaches its destination 15 minutes late. The distance travelled by train is:
विकल्प
30 kms
40 kms
70 kms
80 kms
उत्तर
70 kms
Explanation:
Let Distance be D
Time T1, when Speed is 40 km/hr` ="D"/40`
Time T2, when Speed is 35 km/hr`="D"/35`
According to the question,
`"D"/35-"D"/40=15/60`
D = 70 km.
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