1.

A train covers first 100 km in 4 hrs and next 200 km in 5 hrs. What is its average speed?

Answer»

Answer:Let the speed in FIRST CASE be S1

Let the speed in SECOND case be S2

S1=100/4=25 KM/hr.

S2=200/5=40 km/ hr.

AVG speed=(S1+S2)/2

=(25+40)/2

=65/2

=32.5km/hr.

Explanation:



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