A pilot flies an aircraft at a certain speed for a distance of 800 km He could have saved 40 min by ...........

Quant (SSC) Problems on trains

A pilot flies an aircraft at a certain speed for a distance of 800 km. He could have saved 40 min by increasing the average speed of the plane by 40 km/h. Find the average speed of the aircraft.

200 Km/h

300 Km/h

240 Km/h

160 Km/h

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Explanation:

Let the average speed be a km/hr
Time taken by aircraft (t) = 800/a
As per the condition : t – 40/60 = 800 /a + 40
⇒ 800/a - 800 /a + 40 = 2/3
⇒ 32000 /a(a + 40) = 2/3
⇒ a( a + 40 ) = 48000
⇒ a = 200 Km/hr