In a flag race, a pole is placed at the starting point, which is 10m from the first flag and the other flags are placed 6m apart in a straight line. There are 10 flags in the line. Each competitor starts from the pole, picks up the nearest flag, comes back to the pole and continues the same way until all the flags are on the pole. Find the total distance covered.

Open in App

Solution

We have,
$d_{1}$ = distance travelled to pick up the first flag
= 10 + 10 = 2 $\times$ 10 = 20 m
$d_{2}$ = distance travelled to pick up the second flag
= 2 $\times$ (10 + 6) = 32m
$d_{3}$ = distance travelled to pick up the third flag
= 2 $\times$ (10 + 6 + 6)
= 44 m
$d_{10}$ = distance travelled to pick up 10th flag
= 2 $\times$ [10 + (10 - 1) $\times$ 6]m = 128
This forms an A.P with a = 20, d = 12 and n = 10
$∴$ Total distance travelled
$= d_{1} + d_{2} + d_{3} + \dots + d_{10} S_{n} = \frac{n}{2} [2 a + (n - 1) d] = \frac{10}{2} [2 \times 20 + (10 - 1) 12] = 5 (40 + 108) = 5 \times 148$
= 740m

Suggest Corrections

Similar questions

In a flag race, a pole is placed at the starting point, which is 10m from the first flag and the other flags are placed 6m apart in a straight line. There are 10 flags in the line. Each competitor starts from the pole, picks up the nearest flag, comes back up the next flag and continues the same way until all the flags are on the pole. The total distance covered is

In a flag race, a pole is placed at the starting point, which is 10m from the first flag and the other flags are placed 6m apart in a straight line. There are 10 flags in total. Each competitor starts from the pole, picks up the nearest flag, comes back to affix the flag onto the pole, picks up the next flag and continues the same way until all the flags are on the pole. The total distance covered is

In a flag race, a pole is placed at the starting point, which is 10m from the first flag and the other flags are placed 6m apart in a straight line. There are 10 flags in the line. Each competitor starts from the pole, picks up the nearest flag, comes back to the pole and continues the same way until all the flags are on the pole. Find the total distance covered.

Q. In a flag race, a pole is placed at the starting point, which is 10m from the first flag and the other flags are placed 6m apart in a straight line. There are 10 flags in the line. Each competitor starts from the pole, picks up the nearest flag and comes back to the pole and runs for the next flag and continues the same way until all the flags are on the pole. The total distance covered is ____.

Join BYJU'S Learning Program