Question

a bus travelling at 42 km per hour covers a distance in 5 hour how much time would it save if it increased its speed by 8 km per hour

Answer 1

Speed=distance/time………(1)

Distance=Speed*time

So,

Distance=42km/hr*5hr=210 km

Therefore,time required when speed is increased by 8 km/hr:

Time =Distance/speed….from(1)

Increased speed=(42+8)km/hr=50km/hr

Time=210/50

Time=4.2hr

Time  required when speed is increased by 8km/hr is 4.2 hr.