Question 1165417
262 km/h is 262000 m/h or 72.7778 m/sec
to go 1700 m requires 23.3588 sec.

at 228 km/h or 228000 m/h or 63.3333 m/sec, the car took 13.4211 sec to go 850 m, half the distance.
There are 9.9377 sec left to go 850 m.
That is 85.532 m/sec or 307.92 or 308 km/h (must round up regardless of the decimal quantity when a minimum qualifying time is present.)