Answer is:
Rs. 9,586
Answer is:
30 years
Answer is:
Rs. 175
Answer is:
12 Km/hr
Explanation:
The way to solve this is to find the time it took for each lap, add those 4 numbers and divide the sum into the length of 4 laps.
Let’s say the distance of one lap is ‘d’ kilometres.
The time it took to complete the lap at 12 km/h is d/12; the time for the 2nd lap is d/16; for the 3rd lap d/15; and for the 4th lap d/10.
Now if we add these 4 times we get d/12 + d/16 + d/15 + d/10 =
(20d + 15d + 16d + 24d)/240 = 75d/240 = 5d/16 (the total of the 4 ‘heats’)
So the average speed (distance/time) is 4d/(5d/16) = 64/5 km/h = 12.8 km/h