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Sum of ages of 30 students = 30 x 15 = 450 years Actual sum of ages of 30 students = (450 - 15 + 9) = 444 years Actual average of 30 students = (444/30) = 14.8 years
Identify the cases where two objects moving in opposite directions have a relative speed of 30 km/h.
Average speed of ‘A’ during a 24-hour journey is 36 km/h. If he covered the first 150 km of his journey at a speed of 15 km/h, then find the speed a...
'A' starts a journey and covers the first half of the total distance at a speed of 15 km/hr. Then, he travels half of the remaining distance at 5 km/hr ...
Travelling at a speed of 54 km/h, Chaman reaches a place 3 minutes early. If he had travelled at a speed of 48 km/h, he would have been 1 minute late. W...
Krishna covers a certain distance by train at 25 km/hr. and the equal distance on foot at 4 km/hr. If the time taken by him for the whole journey be 5 ...
A train 180 meters long passes a man walking in the same direction at 6 km/h in 15 seconds. What is the speed of the train?
Ajay and Vishal left the place ‘X’ with different speeds which are in the ratio 3:2 respectively. Ajay left the place 42 seconds after Vishal. If af...
Find the distance travelled (in km) by the truck to reach point B from point A, if a car cover 45% the same distance in 2 hours 42 minutes and a truck c...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 23 km/hr and 24 km/hr, respectively. If the distance covered by ‘Aâ...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 24 km/hr and 10 km/hr, respectively. If the distance covered by ‘Aâ...
