a plane left 30 minutes later than the scheduled time and inorder to reach the desination, 1500km away in time. It has to increase the speed by 250km/h from the usual seed. Find the usual speed?

Let the usual speed of the plane be *x* km/hr.

Increased speed of the plane = (*x* + 250) km/hr

Time taken to reach the destination at usual speed,

Time taken to reach the destination at increased speed,

Given, *t* _{1} – *t* _{2} = 30 min

Thus, the usual speed of the plane is 750 km/hr.

**
**