a motor car starts with the speef of 70km/hr with its speed increasing every two hours by 10 kmph.in how many hours will it cover 345 kms?
Answers
Answer:
Step-by-step explanation:
in the first hour it covers 70*1=70KM
in the second hour it covers=70+70*1=140KM
in the third hour it increases its speed by 10kmph then speed becomes 80kmph
now distance covered=70+70+80*1=220KM
fourth hour=220+80*1=300KM
in the fifth hour=300+80*1=380KM but it has to cover only 345KM
so we can take till four hours and 9/16th of fifth hour
in order to cover 345KM
300+(9/16)*80=345KM
so the time taken is 4 9/16hrs
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