Simon intends to drive to attend an appointment at 8pm.
If he drives at 75 km/h, he will be 13 minutes late.
If he drives at 115 km/h, he will be 11 minutes early.
If he wants to be exactly on time for his appointment,
(a) at what speed should he drive? (Give your answer correct to 2 decimal places)
(b) at what time must he start driving at the speed in (a)?
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