a car travels at 54km/h for first 20sec,36km/h for next 30sec and finally 18km/h for next 10sec. find its average speed
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first convert 54 km/hr into m/sec so 54×5÷18=15m/sec.then 36×5÷18=10m/sec .then 18×5÷18=5m/sec.then 15m/sec for 20sec so on multiplying it gives you the distance so 15×20=300m.then10×30=300m.then 5×10=50m.so total distance travelled =300m+300m+50m=650m.so AVG. SPEED =distance travelled÷time taken =650÷60=10.9m/sec
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