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Q) A man covers half of his journey at 6 kilometre per hour and the remaining half at 3 kilometre per hour his average speed is
(A) 4.5 km/h
(B) 3 km/h
(C) 4 km/h
(D) 9 km/h
Correct Answer - Option
(C)
Explanation :
Find total time taken. Let total distance is 2x, hence first half distance will be covered in x/6 hours, similarly last half distance will be covered in x/3 hours. Now add both times taken. Total time taken is x/2 hours. Average speed = total distance/ total time => 2x/x/2 => 4 km/h is answer
Q) If a train runs at 40 km/h it reaches its destination late by 11 min, but if it runs at 50 km/h it is late by 5 min only. the correct time for the train to complete its journey is
Q) A constable is 114 behind a thief. The constable runs 21 mtr in a min and the thief 15 mtr in a minute. in what time will the constable catch the thief?
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