A car driver is moving towards a fired rocket with a velocity of `8hati ms^(-1)` . He observed the rocket to be moving with a speed of `10 ms^(-1)`. A stationary observer will see the rocket to be moving with a speed of
Options:
(a) `5ms^(-1)`
(b) `6ms^(-1)`
(c) `7ms^(-1)`
(d) `8ms^(-1)`