Question

A body moves at a speed of
20

k
m

h
−
1
for the first
2
hours. After that, it moves at the speed of
30

k
m

h
−
1
for the next 1 hour. What is the total distance travelled by the body?

Answer 1

Answer:

pH is very important in our digestive system. In the stomach, hydrochloric acid is secreted as food enters the stomach. It turns the pH of the stomach between 1 and 3. This pH is important for the activation of the enzyme pepsin, which helps in the digestion of protein in food.

Answer 2

Correct Question:

A body moves at a speed of 20 km/h for the first 2 hours. After that, it moves at the speed of 30 km/h for the next 1 hour. What is the total distance travelled by the body?

Solution:

The main concept that is used in the relation between distance, time and speed. The main formula to be used here is:

$\sf{\implies\:Distance=Speed\times\:Time}$

This is derived from the main formula:

$\sf{\longrightarrow\:Speed=\dfrac{Distance}{Time}}$

Part 1:

Speed of the body = 20 km/h

Time taken = 2 hours

Applying the formula here:

Distance = 20 x 2

Distance = 40 km

The distance covered in part 1 is 40 km.

Part 2:

Speed of the body = 30 km/h

Time taken = 1 hour

Applying the formula here:

Distance = 30 x 1

Distance = 30 km

The distance covered in part 2 is 30 km.

Total distance covered:

= Distance in Part 1 + Distance in Part 2

= 40 + 30

= 70 km

Hence the total distance covered by the body is 70 km.