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Question

An airliner concorde flies 2000 km at a speed of 1600 km/h and then returns due to bad weather at a speed of 1000 km/h. Find the average speed for the whole trip.

A
1240 km/hr
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B
1230.77 km/hr
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C
1330 km/hr
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D
1245.77 km/hr
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Solution

The correct option is D 1230.77 km/hrWhile travelling to the destination,Distance traveled, d=2000 kmSpeed of the plane s=1600 km/hrTime taken, t=dst1=20001600=1.25 hoursWhile returning from the destination,Distance traveled, d=2000 kmSpeed of the plane s=1000 km/hrTime taken, t=dst2=20001000=2 hoursAverage speed =totaldistancetraveledtotaltimetaken=2000+20001.25+2=40003.25=1230.77 km/hr

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