With an average speed of 40km/hr, a train reaches its destination in time. If it goes with an average speed of 35km/hr, it is late by 15 minutes. The total journey is

Options

A. 30km
B. 40km
C. 70 km
D. 80 km

Answer

To solve the problem step by step, we will use the relationship between distance, speed, and time. The formula we will use is:

\[ \text{Distance} = \text{Speed} \times \text{Time} \]

### Step 1: Define Variables
Let the distance be \( D \) km.
Let the time taken to reach the destination at 40 km/hr be \( t \) hours.