Question

A motor starts with speed of 70km/hr with its speed increasing every 2 hrs by 10km/hr. In how many hrs will it cover 345 km

Answer 1

16 he takes to covered distance

Answer 2

Answer:-

(e) None of these

Step - by - step explanation:-

To find :-

Find time ,

Solution:-

Starting speed = 70 km/hr

In first two hours it is = 140 km

For next two hours ,

Speed increased 10 km/hr

→ 70 + 10 = 80 km/hr

For two hours = 80 km

Hence,

Total distance now = 140 +160 = 300 km

Hence,In time of 4 hours it covers 300 km.

Now speed is 90 km/hr

It will take in half hour 45 km remaining to covers it 90 km/hr

Hence ,

It need 4 hours 30 minutes to covers 345 km.