Question

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Answer 1

Answer:

The average speed is 420 km/h

Step-by-step explanation:

Given in question -

• Distances = 2500 km (1), 1200 km (2), 500 km (3)
• Speed =  500 km/h (1), 400 km/h  (2), 250km/h (3)

Formula -

Speed (s)  = Distance (d)

                        Time(t)

Time (t) = Distance (d)

                Speed (s)

Average speed (as) = Total Distance (td)

                                      Total Time (tt)

Calculation -

td = Sum of all distances

     = (2500 + 1200 + 500) km = 4200 km

tt = Sum of all time periods = t1 + t2 + t3

• t1 = 2500 km/ 500 km/h = 5 hours
• t2 = 1200 km/ 300 km/h = 3 hours
• t3 = 500 km/ 250 km/h  = 2 hours

tt = (5+4+2) hours = 10 hours

Hence,

        average speed = 4200km  = 420km/h

                                      10 hours