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Question

A train which is moving at an average speed of 40 kmph, reaches its destination on time.When its average speed reduces to 5 kmph, then it reaches its destination 15 minutes late. The distance travelled by the train is

A
30 km
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B
40 km
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C
70 km
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D
80 km
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Solution

The correct option is B 70 km
Let Distance be D
Time T1, when Speed is 40 km/hr=D40
Time T2, when Speed is 35 km/hr=D35
According to the question,
D35D40=1560
D=70 km

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