Question

Q.26) A car covers 30 km at a uniform speed of 60 km hr and next 30 km at a uniform speed of 40 km/hr. Find the total time taken.​

Answer 1

Answer:

Tofind:−

we need to find Total time taken by car to cover whole journey.

\huge\bf\underline \green{ \mathcal{S}olution...}

Solution...

\bf\underline{\purple{Given:-}}

Given:−

Case 1st :-

✫ Car cover 30 km with a uniform speed of 60km/hr.

we know that,

\huge\star \: \bf \red{time \: = \frac{distance}{speed} }⋆time=

speed

distance

So,

Speed = 60km/hr

Distance = 30km

↛ Time taken = 30/60

↛ Time taken = 1/2 hr

Case 2nd :-

After that the car covers next 30 km at 40 km/hr.

Speed = 40km/hr

Distance = 30km

↛ Time taken = 30/40

↛ Time taken = 3/4 hr

Total time taken by car :-

= 1/2 + 3/4

= (2 + 3)/4

= 5/4 hr.

Hence,

Total time taken by car = 5/4 hr

Answer 2

Answer:

1 hr 15 min

Explanation:

1) d1=30 kms, v1=60km/hr, that implies t1=d1/v1=30/60=1/2hr

2)d2=30kms,v2=40km/hr, that implies t2=d2/v2=30/40=3/4hr

3)total time= (1/2)+(3/4)=5/4hrs

4) 5/4 hrs =(5/4)*60 mins = 75 mins=1hr 15 mins