Question

A train runs from New Delhi to Hyderabad. It covers first distance of 420 km in 7 hrs and next distance of 360 km in 6 hrs.​

Answer 1

Correct Question:

A train runs from New Delhi to Hyderabad. It covers first distance of 420 km in 7 hrs and next distance of 360 km in 6 hrs. Find the average speed of train.

Calculation:

• Average speed calculated by dividing the total distance by total time.

• Let average velocity be v.

$\therefore \: v = \dfrac{total \: distance}{total \: time}$

$\implies\: v = \dfrac{420 + 360}{7 + 6}$

$\implies\: v = \dfrac{780}{13}$

$\implies\: v = 60 \: km/hr$

So, average velocity of the train is 60 km/hr.

Answer 2

Answer:

Displacement= 360 and 420

=360+420=780

Explanation:

time= 7 and 6 hours

=7+6=13

speed= distance/time

720/13=60km/hr