Question
A train covers a distance of 40 km at the speed of 30
km/h the next 33 km distance covers with a speed of 44 km/h and last 80 km with the speed of 64 km/h find the average speed of the train?Solution
Since the train covers different distance with different speeds. So, Average speed = Total Distance/Total Time Total distance = 40 + 33 + 80 = 153 km Time1 = 40/30, Time2 = 33/44 & Time3 = 80/64 Total Time = 40/30 + 33/44 + 80/64 Therefore, Average Speed = 153/(40/30 + 33/44 + 80/64) = 45.9 km/hr
The average marks obtained by a student in a certain number of tests is 36. His average increases by 2 when he scores 90 in his next test. Find the tota...
The average of first two numbers and last two numbers of a set of six numbers is 70 and 45 respectively. If the overall average of all six numbers is 65...
The average monthly expense of a family of 5 is ₹25,000. If the highest earning member moves out, the average drops to ₹20,000. Find the monthly exp...
[123 ÷ 8 ÷ 9] × 144 = ? + 12 × 5
The average of 17 numbers is 48. The average of first 9 numbers is 45 and average of next 9 numbers is 52. If 9th number is excluded, then th...
In a cricket match the captain of one of a team scored 26 runs more than the average runs scored by the remaining 10 batsmen of that team who batted in ...
18 years ago the average age of a family of four members was 45 years. Two children were born in that span of 18 years. The present average age of the ...
The average weight of 30 students in a class increases by 0.5 kg when the weight of the principal is included. If earlier the average weight of the stud...
There are only 220 students living in hostel. If 20 students left hostel, then overall expenditure of mess is reduced by Rs. 800 weekly but per student ...
The average age of 6 sisters is 30 yr. If the age of the youngest sister be 5 yr. What was the average age of the group of sister just before the birth ...
Relevant for Exams:
