As you asking I am telling Distance between Mumbai CST to IIT Bombay is approx 28 KM

Direction to go there :

Chhatrapati Shivaji Terminus
Chhatrapati Shivaji Terminus Area, Fort, Mumbai, Maharashtra 400001
Walk south on Dr Dadabhai Naoroji Rd towards Mahapalika Marg
120 m
Turn left onto Walchand Hirachand Marg
Pass by Malhotra House (on the right in 200 m)
350 m
Turn left at Sardar Awar Singh Bedi Chowk onto PD Mello Rd
Pass by Hotel Manama (on the right in 180 m)
3.4 km
At Rosary School, continue onto Barrister Nath Pai Marg
Pass by Arman Apartment (on the left in 350 m)
750 m
Slight right towards St Savata Mali Marg
240 m
Turn right onto St Savata Mali Marg
83 m
Turn left onto Bombay Port Trust Rd
2.9 km
Turn left onto Railway Crossing Rd
71 m
Turn right onto Sewri Cross Rd
1.0 km
Turn right
1.0 km
Slight right onto Rafi Ahmed Kidwai Marg
Pass by Institute of Chemical Technology (ICT) (on the left in 900 m)
1.6 km
Continue onto Dr Baba Saheb Ambedkar Rd
Pass by Krishna Kunj (on the right in 400 m)
600 m
Turn right after Indian Overseas Bank (on the right)
16 m
Turn left to stay on Tamil Sangam Road
500 m
Turn right onto Rd Number 15
90 m
Turn left onto Rd Number 28A
450 m
Turn left onto Rd Number 8
61 m
At the roundabout, take the 1st exit
Pass by Axis Bank ATM (on the right in 150 m)
250 m
Turn left onto Station Rd
Pass by Our Lady of Good Counsel High School (on the right in 220 m)
350 m
Station Rd turns slightly right and becomes Lal Bahadur Shastri Marg
Pass by Kalpana Cinema Hall (on the right in 3.9 km)
4.2 km
Slight left onto Andheri - Kurla Rd/Magan Nathuram Rd
Pass by Hari Masjid (on the left in 1.5 km)
2.9 km
Continue onto Saki Vihar Rd
Pass by State Bank of India (on the right in 200 m)
950 m
Turn right onto Chandivali Farm Rd
Pass by ICICI Bank Chandivali, Mumbai - Branch & ATM (on the right in 850 m)
1.1 km
Turn left after ICICI Bank (on the right)
Pass by the lake (on the right in 170 m)
700 m
Turn right towards Adi Shankaracharya Marg/JVLR/Powai Flyover
Walk along the lake (on the left)
260 m
Continue onto Adi Shankaracharya Marg/JVLR/Powai Flyover
Continue to follow Adi Shankaracharya Marg/JVLR
Pass by Cafe Mangii Powai (on the right in 500 m)
1.2 km
Slight left
550 m
Turn left after State Bank of India (on the left)
Restricted-usage road