If first 12 km are traveled at a speed of 40 km/hr and the next 9 km are traveled at the speed of
45 km/hour, the average speed is ?
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= > Distance (s) = 40km. = > Time (t) = 5hrs . = > 8 km /hr . 5 hrs = 5 × 60 × 60 sec.
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Step-by-step explanation:
IF A MAN TRAVELS 12 KM AT 40 KM/HR THEN THE TIME TAKEN TO REACH=3.3 MINUTES
IF A MAN TRAVELS 9KM AT THE SPEED OF 45KM/HR THEN THE TIME TAKEN =0.2MINUTES
AVERAGE SPEED= TOTAL DISTANCE/ TOTAL TIME TAKEN
TOTAL DISTANCE=12+9=21KM
TOTAL TIME=3.3+0.2=3.5minutes
21/3.5 =6
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