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ICSE Class 7 Answered

Mohan travels in an aeroplane at a distance of 1200 km for the first half of the distance the plane flies at a speed of 900 km per hour and to the rest of the distance is flies at a speed of 750 kilometre per hour how long does the Trip take

Asked by arpanmaity1205 | 27 Sep, 2020, 06:31: PM
Expert Answer
For the first half, the speed is 900 km per hour
Half of the total distance = 600 km
To travel first 600 km, the speed is 900 km per hour
Speed = 900/60 = 15 km per minute
Time(t1) = Distance/Speed = 600/15 = 40 minutes
For the next 600 km, the speed is 750 km per hour 
Speed = 750/60 = 25/2 km per minute
Time(t2) = Distance/Speed = 600/(25/2) = (600 x 2)/25 = 48 minutes
Total time taken = t2 + t1 = 40 + 48 = 88 minutes = 1 hour 28 minutes
Answered by Renu Varma | 28 Sep, 2020, 12:08: PM
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