Walking at 4/7 of its usual speed, a train is 9 minutes late. Find its usual time to cover the journey. ( A ) 10 ( B ) 12 ( C ) 8 ( D ) 15
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Answer:
(B) 12
Step-by-step explanation:
let distance covered by train be 'd'
let speed be 'v'
according to the problem
7d/4v-d/v=9
3d/4v=9
d/v=12
time taken=12 min
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