An aeroplane takes 3 hours to cover a distance of 3600 km. Another plane travels at a speed whuch is 100 km per hour less than 1st plane. How long will the 2nd plane take to cover the same distance?
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Solution,
for 2nd plane,
to cover a distance of 3300 km a plane takes=3 hours
to cover a distance of 1 km a plane takes=3/3300 hr
to cover a distance of 3600 km a plane takes=3/3300×3600=36/11 hr= 3.27 hrs
for 2nd plane,
to cover a distance of 3300 km a plane takes=3 hours
to cover a distance of 1 km a plane takes=3/3300 hr
to cover a distance of 3600 km a plane takes=3/3300×3600=36/11 hr= 3.27 hrs
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3 (3/11)hrs will be taken by the 2nd plane to cover the D
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