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M: +1.00/-0.25

The distance of the School from the house of Suresh is 80 km. One day he was late by 1 hour than the normal time to leave for the college, so he increased his speed by 4 km/h. and thus he reached to college at the normal time. What is the changed speed of Suresh?

[IB ACIO Previous Year 2017]
A
B
C
D