A car travels hundred kilometre distance at a speed of 60 km per hour and returns with a speed of 40 km per hour calculate its average speed for the whole journey with the diagram
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Answered by
9
Distance/speed = 100/60 hr
= (100/60)*60 = 100 mins
Speed return = 40 km/h
time taken one side = Distance/speed = 100/40 hr
= (100/40)*60 = 150 mins
Total time take = 100 + 150 = 250 min
= 250/60 hr
= 25/6 hr
Total distance = 100 + 100 = 200 km
Average speed = 200/(25/6) = 48 km/hr
Hope it helps ✅❤
Answered by
6
Average speed = Total distance / Total time
=> 100+100 / t1 +t2
We know that time = d/s
=> t1 = 100/60 = 5/3
=> t2 = 100/40 = 5/2
Average speed = 200 / 5/2+5/3
=> 200 / (15+10)/6
=> 200 / 25/6
=> 200×6 / 25
=> 1200 / 25
=> 48 km/h
Average speed for whole journey = 48 km/h
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