Tsk tsk. You are mistaken sloppy indian journalisme for real facts.
The missile rose on the dot at 2.30 p.m. from a canister strapped on to the ground, climbed to an altitude of 40 km and sped at 7.5 Mach, that is, 7.5 times the speed of sound. It covered its full range of 700 km in 500 seconds.
That poor soul just divided the distance with the duration and come up with the 7,5 mark. Read it more carefully.
Shourya is the land-variant of India's K-15 missile which is launched under the water and is being fitted into the Navy's nuclear-powered submarine, Arihant.
k-15 is a ballistic missile.
The inside story of SLBM K-15 » Indian Defence Review
The 27th Jan test-firing saw the K-15’s first-stage solid-fuel rocket booster being ignited inside a pontoon-based silo 20 metres under water & being lifted up to an altitude of 7km. Then the second-stage solid-fuel rocket ignited & lifted the K-15/B-05 to
an altitude of 40km, following which the K-15 adopted a depressed trajectory flight-path.
Same altitude as shourya, coincidence? only if you are an indian fanboy.
Then comes this part.
The missile is ten metres long, 74 cm in diameter and weighs 6.2 tonnes. Its two stages use solid propellants.
A cruise missile? no freaking way. It is a ballistic missile.