An aeroplane travelled a distance of 400 km at an average speed of x km/hr. On the return journey, the speed was increased by 40 km/hr. Write down an expression for the time taken for: (i) the onward journey, (ii) the return journey. If the return journey took 30 minutes less than the onward journey, write an equation in x and find the value of x.
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Step-by-step explanation:
let the speed be x
total distance = 400
now ,
400/x - 400 /x + 40 = 30/60
solve this you got the answer
hope it help you
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