Question

A car travels at a speed of 20km per hr for 2h and at 60km per hr for the next two hr. Find average speed?

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Answer 1

we know that average speed is equals to Total distance travelled upon total time taken

20+60/2+2

80/4

20km/h

Answer 2

Answer:

Formula

Average speed=

2xy/x+y

2×20×60/20+60

2×20×60/80

=30 km/hrs