IIMB 2001 (QA) PYQs

A car travels the first $160$ km at a speed of $64$ km/hr and the next $160$ km at a speed of $80$ km/hr . What is the average speed for the first $320$ km of the tour ?

At $4:00$ am, a Boeing $787$ flying north at $500$ km/h passes over City X. Half an hour later, a Jet Airways aircraft flying east at $400$ km/h passes over the same city at the same altitude. Calculate the distance between the two planes at $6:00$ am, rounded to the nearest $100$ km.

A car travels the first $160$ km at a speed of $64$ km/hr and the next $160$ km at a speed of $80$ km/hr . What is the average speed for the first $320$ km of the tour ?